Marine Weather and Tide Forecast for South Duxbury, MA
 | Sunrise 6:48 AM Sunset 4:14 PM Moonrise 1:54 PM Moonset 1:11 AM |
Marine Forecasts
NOTE: Zones were updated 3/20/2025. If your report is out of date, please click Edit
ANZ231 Cape Cod Bay- 104 Pm Est Sat Nov 29 2025
.small craft advisory in effect until 7 pm est this evening - .
This afternoon - NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave detail: nw 3 ft at 5 seconds and se 1 foot at 9 seconds.
Tonight - NW winds 10 to 15 kt, becoming E around 5 kt after midnight. Seas around 2 ft. Wave detail: N 2 ft at 5 seconds and se 1 foot at 9 seconds.
Sun - S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave detail: S 3 ft at 4 seconds and N 1 foot at 5 seconds. A chance of rain in the afternoon.
Sun night - S winds 15 to 20 kt, becoming W after midnight. Gusts up to 25 kt. Seas 2 to 4 ft. Wave detail: S 4 ft at 9 seconds and se 3 ft at 5 seconds. Rain. Patchy fog in the evening with vsby 1 to 3 nm.
Mon - NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave detail: W 3 ft at 4 seconds and S 2 ft at 8 seconds.
Mon night - NW winds 10 to 15 kt with gusts up to 20 kt, becoming S around 5 kt after midnight. Seas 2 to 3 ft. Wave detail: N 3 ft at 5 seconds and se 1 foot at 7 seconds.
Tue - SE winds 5 to 10 kt. Seas around 2 ft. Rain. Vsby 1 to 3 nm.
Tue night - NE winds 25 to 30 kt. Seas 2 to 4 ft. Rain. Vsby 1 to 3 nm.
Wed - NW winds 25 to 30 kt. Seas 3 to 5 ft. A chance of rain.
Wed night - W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft.
seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 104 Pm Est Sat Nov 29 2025
Synopsis for massachusetts and rhode island coastal waters - Gusty westerly winds Sat as low pressure moves into the maritimes. High pres builds into the waters Sat night and moves offshore Sun. A cold front moves across the waters Sun night into Mon. A stronger low pressure crosses in the vicinity of sne Tue/wed.
7 Day Forecast for Marine Location Near South Duxbury, MA
NEW! Add second zone forecast
| Plymouth Click for Map Sat -- 12:11 AM EST Moonset Sat -- 05:43 AM EST 9.07 feet High Tide Sat -- 06:49 AM EST Sunrise Sat -- 12:03 PM EST 1.23 feet Low Tide Sat -- 12:53 PM EST Moonrise Sat -- 04:12 PM EST Sunset Sat -- 06:02 PM EST 9.17 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Plymouth, Massachusetts, Tide feet
| 12 am |
| 0.8 |
| 1 am |
| 1.9 |
| 2 am |
| 3.7 |
| 3 am |
| 5.6 |
| 4 am |
| 7.5 |
| 5 am |
| 8.8 |
| 6 am |
| 9 |
| 7 am |
| 8.2 |
| 8 am |
| 6.7 |
| 9 am |
| 5 |
| 10 am |
| 3.3 |
| 11 am |
| 1.9 |
| 12 pm |
| 1.2 |
| 1 pm |
| 1.8 |
| 2 pm |
| 3.2 |
| 3 pm |
| 5.1 |
| 4 pm |
| 7 |
| 5 pm |
| 8.5 |
| 6 pm |
| 9.2 |
| 7 pm |
| 8.6 |
| 8 pm |
| 7.2 |
| 9 pm |
| 5.4 |
| 10 pm |
| 3.5 |
| 11 pm |
| 1.8 |
| Cape Cod Canal Click for Map Sat -- 12:11 AM EST Moonset Sat -- 12:26 AM EST 3.84 knots Max Flood Sat -- 04:05 AM EST -0.17 knots Slack Sat -- 06:48 AM EST Sunrise Sat -- 06:55 AM EST -3.81 knots Max Ebb Sat -- 09:54 AM EST 0.17 knots Slack Sat -- 12:49 PM EST 3.56 knots Max Flood Sat -- 12:53 PM EST Moonrise Sat -- 04:09 PM EST -0.10 knots Slack Sat -- 04:13 PM EST Sunset Sat -- 07:16 PM EST -4.05 knots Max Ebb Sat -- 10:18 PM EST 0.18 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Cape Cod Canal, Massachusetts Current, knots
| 12 am |
| 3.8 |
| 1 am |
| 3.8 |
| 2 am |
| 3.4 |
| 3 am |
| 2.6 |
| 4 am |
| 0.8 |
| 5 am |
| -2.5 |
| 6 am |
| -3.5 |
| 7 am |
| -3.8 |
| 8 am |
| -3.4 |
| 9 am |
| -2.5 |
| 10 am |
| 0.8 |
| 11 am |
| 2.7 |
| 12 pm |
| 3.4 |
| 1 pm |
| 3.6 |
| 2 pm |
| 3.3 |
| 3 pm |
| 2.6 |
| 4 pm |
| 1 |
| 5 pm |
| -2.4 |
| 6 pm |
| -3.5 |
| 7 pm |
| -4 |
| 8 pm |
| -3.9 |
| 9 pm |
| -3.1 |
| 10 pm |
| -1.5 |
| 11 pm |
| 2.3 |
FXUS61 KBOX 291852 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 152 PM EST Sat Nov 29 2025
SYNOPSIS
Dry and cold weather continues Saturday night, along with a diminishing wind. A warm front brings a period of rain and wind late Sunday morning into the afternoon/evening, with rain moderate to heavy at times, along with milder temperatures. A cold front ushers in a return to drier and colder conditions Monday. Low pressure tracking south of New England likely brings the seasons first accumulating snow to interior portions of CT and MA. However, details regarding the rain/snow line and specific accumulations are still uncertain.
NEAR TERM /THROUGH TONIGHT/
Key Messages...
* Another cold night with lows in the 20s
1030+ mb ridge west of New England continues to advect eastward this afternoon, resulting in diminishing winds. This combined with a mostly clear conditions and a dry airmass, with dew pts in the teens, will support ideal radiational cooling conditions tonight.
Thus, we followed the colder MOS guidance for lows tonight, mainly in the 20s regionwide. As WAA aloft commences later tonight, increasing high clouds combined with surface winds becoming SE, will likely result in temps leveling off late. Hence, coldest temps occur late this evening to just after midnight.
SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/
Key Messages...
* Rain late Sunday morning into afternoon & evening
* Milder, with highs in the 40s to lower 50s in SE MA
* Becoming breezy with south winds 15-25 mph
Chilly, but a dry start to the day Sunday. However, rain overspreads the region from late morning into the early afternoon, as a warm front approaches the area. Model soundings suggest the column may be cold enough for the precip possibly to begin as a brief period of snow across western/central CT/MA between 10 AM and 1 PM. This will be short lived, as the boundary layer rapidly warms, with any snow quickly changing to rain. Otherwise, strong thermal and moisture advection results in a period of rain, briefly moderate to heavy at times. Good model agreement on QPF totals ranging from 0.25 to 0.50, with steadiest and heaviest rain from approximately 4P-10P, west to east. A chilly rain for the interior, but in the coastal plain (including the I-95 corridor), dew pts rise through the 40s to near 50, as the warm sector advects northeast. This will yield a noticeably milder day, with highs in the 40s regionwide and low 50s possible over southeast MA.
Becoming breezy Sunday afternoon & evening, especially in the coastal plain, as warm sector overspreads the region. Model soundings support south winds 15-25 mph, with gusts up to 35 mph across southeast MA possible, including Cape Cod and the Islands.
Less wind across the interior valleys, as it takes longer to scour out/erode today/tonight cold air.
The system remains progressive, with FROPA occurring later Sunday night and dry weather overspreading SNE, along with increasing CAA toward Monday morning.
LONG TERM /MONDAY THROUGH FRIDAY/
Key Messages
* Dry with seasonable temperatures to start the work week on Monday
* A coastal low-pressure system will bring substantial precipitation to southern New England Tuesday evening, with the potential for a plowable/shovelable snow for interior southern New England
* Cold and dry Wednesday-Saturday with next chance for precip Friday night
Monday and Monday night
Low-level northwest flow behind an exiting cold front will support cold/dry weather in southern New England on Monday with modest northwest winds. High pressure builds over the region Monday afternoon supporting sunny skies. Temperatures will be below normal on Monday with highs in the upper 30s to low 40s. For reference, the normal high temperature in Boston for December 1st is 52 degrees.
Monday night is expected to feature efficient radiational cooling with light winds and clear skies for at least the first half of the night. Later in the evening winds are forecast to shift south as high pressure builds east of the region. This will result in increasing cloudiness into Tuesday morning as warmer air from the south overruns the cooler air already in place. Nonetheless, we should radiate enough to experience chilly temperatures Tuesday morning with lows in the teens and 20s for much of southern New England. The coastal areas, especially The Cape/Islands should be more mild with temps in the upper 20s/low 30s.
Tuesday and Tuesday night
The highlight of the extended forecast is the forecast for Tuesday.
An area of low-pressure is expected to develop near The Gulf Coast and move up the eastern seaboard Tuesday afternoon and evening.
Confidence is moderate to high that this system will bring substantial precipitation to southern New England between Tuesday night and Wednesday morning. NBM probabilities for greater than 0.25 inches of liquid precipitation are currently ranging from 75-90 percent. There is far less confidence however, with respect to potential snowfall for southern New England. A few scenarios are in play, but latest ensemble guidance has given the best chance for a plowable/shovelable (3-4 inches) of snowfall across interior MA and the high terrain.
Snowfall potential will be laregly governed by the storm track, which remains uncertain at this time. Until we can get a clearer picture/higher confidence in the storm track we can only lean on probabilstic forecasts to gauge who can expect what. Probablities for greater than 4 inches of snowfall are currently ranging from 30 to 60 percent for areas in Massachusetts north and west of I-495.
Elsewhere, probabilities for 4+ inches of snow are 30 percent or less with near zero probabilities for southeast MA, the southern half of RI, Cape Cod, and The Islands. That's not to say no measureable snow is possible, but the highest chances for a plowable snow residea cross the interior.
Wednesday through Saturday
Low-presure exits east over The Atlantic Wednesday morning. This will be followed by a cold/dry air mass settling over The Northeast for the remainder of the week. Temperatures will be well below normal through next Friday with daily high/low temps in the upper 30s/low 40s and the teens/20s respectively. Thurdsay night/Friday morning looks particularly frigid with low temperatures currently forecast in the low to mid teens. NBM probabilties for MinT<10 degrees are between 20 and 40 percent for Thursday night. The next chance for precipitation looks to be Friday night/Saturday when a wave of low- pressure may pass north and west of southern New England. Stay tuned for further details.
AVIATION /18Z SATURDAY THROUGH THURSDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z update...
Tonight...High Confidence.
VFR. WNW winds diminish.
Sunday...High confidence on trends, somewhat uncertain on exact timing.
VFR to start the day, but rain and MVFR conditions quickly overspread CT/MA/RI between 15z-18z from west to east. Then a period of IFR/LIFR possible 20z-02z from west to east, in moderate to heavy rain, low cigs and areas of fog. Light SE winds in the morning, become S 15-25 KT afternoon and evening, with gusts up to 30 kt along the south coast. This should minimize LLWS, however the core of the low level jet may yield marginal LLWS 21z Sun to 03z Mon over southeast MA, WS020/18045KT.
Sunday night...high confidence on trends, lower on exact timing.
MVFR/IFR at 00z, but quickly improving to VFR with FROPA and the wind shift to the west 15-25 kt.
KBOS Terminal...High confidence in TAF through Sunday morning.
KBDL Terminal...High confidence in TAF through 12z Sunday, then some uncertainty on exact timing details.
Outlook /Monday through Wednesday/...
Sunday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance RA, patchy BR.
Monday: VFR. Breezy.
Monday Night: VFR.
Tuesday: Mainly IFR, with areas MVFR possible. Breezy. RA, chance SN.
Tuesday Night: Mainly VFR, with local IFR possible. Windy with local gusts up to 30 kt. RA likely, chance SN.
Wednesday: VFR. Breezy.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
130 PM update...
Tonight through Sunday night...High confidence.
Gusty WNW winds diminish Saturday evening and overnight. Dry weather and good vsby prevail into Sunday morning. Then a warm front results in a period of rain from late Sunday morning into Sunday evening, with rain and fog limiting vsby to 1-3 miles at times. Light SE winds Sunday morning, become south in the afternoon and evening, increasing with gusts up to 30 kt. Then a cold front sweeps across the RI/MA waters later Sunday night, ushering in dry weather and a wind shift to the west, with speeds 15-25 kt.
Outlook /Monday through Wednesday/...
Sunday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Rain, patchy fog.
Monday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Tuesday: Winds less than 25 kt. Chance of rain. Local visibility 1 to 3 nm.
Tuesday Night: Strong winds with gusts up to 40 kt. Areas of rough seas. Rain likely.
Wednesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 12 ft. Slight chance of rain.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 7 PM EST this evening for ANZ231>235-237-250-251-254>256.
Area Forecast Discussion National Weather Service Boston/Norton MA 152 PM EST Sat Nov 29 2025
SYNOPSIS
Dry and cold weather continues Saturday night, along with a diminishing wind. A warm front brings a period of rain and wind late Sunday morning into the afternoon/evening, with rain moderate to heavy at times, along with milder temperatures. A cold front ushers in a return to drier and colder conditions Monday. Low pressure tracking south of New England likely brings the seasons first accumulating snow to interior portions of CT and MA. However, details regarding the rain/snow line and specific accumulations are still uncertain.
NEAR TERM /THROUGH TONIGHT/
Key Messages...
* Another cold night with lows in the 20s
1030+ mb ridge west of New England continues to advect eastward this afternoon, resulting in diminishing winds. This combined with a mostly clear conditions and a dry airmass, with dew pts in the teens, will support ideal radiational cooling conditions tonight.
Thus, we followed the colder MOS guidance for lows tonight, mainly in the 20s regionwide. As WAA aloft commences later tonight, increasing high clouds combined with surface winds becoming SE, will likely result in temps leveling off late. Hence, coldest temps occur late this evening to just after midnight.
SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/
Key Messages...
* Rain late Sunday morning into afternoon & evening
* Milder, with highs in the 40s to lower 50s in SE MA
* Becoming breezy with south winds 15-25 mph
Chilly, but a dry start to the day Sunday. However, rain overspreads the region from late morning into the early afternoon, as a warm front approaches the area. Model soundings suggest the column may be cold enough for the precip possibly to begin as a brief period of snow across western/central CT/MA between 10 AM and 1 PM. This will be short lived, as the boundary layer rapidly warms, with any snow quickly changing to rain. Otherwise, strong thermal and moisture advection results in a period of rain, briefly moderate to heavy at times. Good model agreement on QPF totals ranging from 0.25 to 0.50, with steadiest and heaviest rain from approximately 4P-10P, west to east. A chilly rain for the interior, but in the coastal plain (including the I-95 corridor), dew pts rise through the 40s to near 50, as the warm sector advects northeast. This will yield a noticeably milder day, with highs in the 40s regionwide and low 50s possible over southeast MA.
Becoming breezy Sunday afternoon & evening, especially in the coastal plain, as warm sector overspreads the region. Model soundings support south winds 15-25 mph, with gusts up to 35 mph across southeast MA possible, including Cape Cod and the Islands.
Less wind across the interior valleys, as it takes longer to scour out/erode today/tonight cold air.
The system remains progressive, with FROPA occurring later Sunday night and dry weather overspreading SNE, along with increasing CAA toward Monday morning.
LONG TERM /MONDAY THROUGH FRIDAY/
Key Messages
* Dry with seasonable temperatures to start the work week on Monday
* A coastal low-pressure system will bring substantial precipitation to southern New England Tuesday evening, with the potential for a plowable/shovelable snow for interior southern New England
* Cold and dry Wednesday-Saturday with next chance for precip Friday night
Monday and Monday night
Low-level northwest flow behind an exiting cold front will support cold/dry weather in southern New England on Monday with modest northwest winds. High pressure builds over the region Monday afternoon supporting sunny skies. Temperatures will be below normal on Monday with highs in the upper 30s to low 40s. For reference, the normal high temperature in Boston for December 1st is 52 degrees.
Monday night is expected to feature efficient radiational cooling with light winds and clear skies for at least the first half of the night. Later in the evening winds are forecast to shift south as high pressure builds east of the region. This will result in increasing cloudiness into Tuesday morning as warmer air from the south overruns the cooler air already in place. Nonetheless, we should radiate enough to experience chilly temperatures Tuesday morning with lows in the teens and 20s for much of southern New England. The coastal areas, especially The Cape/Islands should be more mild with temps in the upper 20s/low 30s.
Tuesday and Tuesday night
The highlight of the extended forecast is the forecast for Tuesday.
An area of low-pressure is expected to develop near The Gulf Coast and move up the eastern seaboard Tuesday afternoon and evening.
Confidence is moderate to high that this system will bring substantial precipitation to southern New England between Tuesday night and Wednesday morning. NBM probabilities for greater than 0.25 inches of liquid precipitation are currently ranging from 75-90 percent. There is far less confidence however, with respect to potential snowfall for southern New England. A few scenarios are in play, but latest ensemble guidance has given the best chance for a plowable/shovelable (3-4 inches) of snowfall across interior MA and the high terrain.
Snowfall potential will be laregly governed by the storm track, which remains uncertain at this time. Until we can get a clearer picture/higher confidence in the storm track we can only lean on probabilstic forecasts to gauge who can expect what. Probablities for greater than 4 inches of snowfall are currently ranging from 30 to 60 percent for areas in Massachusetts north and west of I-495.
Elsewhere, probabilities for 4+ inches of snow are 30 percent or less with near zero probabilities for southeast MA, the southern half of RI, Cape Cod, and The Islands. That's not to say no measureable snow is possible, but the highest chances for a plowable snow residea cross the interior.
Wednesday through Saturday
Low-presure exits east over The Atlantic Wednesday morning. This will be followed by a cold/dry air mass settling over The Northeast for the remainder of the week. Temperatures will be well below normal through next Friday with daily high/low temps in the upper 30s/low 40s and the teens/20s respectively. Thurdsay night/Friday morning looks particularly frigid with low temperatures currently forecast in the low to mid teens. NBM probabilties for MinT<10 degrees are between 20 and 40 percent for Thursday night. The next chance for precipitation looks to be Friday night/Saturday when a wave of low- pressure may pass north and west of southern New England. Stay tuned for further details.
AVIATION /18Z SATURDAY THROUGH THURSDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z update...
Tonight...High Confidence.
VFR. WNW winds diminish.
Sunday...High confidence on trends, somewhat uncertain on exact timing.
VFR to start the day, but rain and MVFR conditions quickly overspread CT/MA/RI between 15z-18z from west to east. Then a period of IFR/LIFR possible 20z-02z from west to east, in moderate to heavy rain, low cigs and areas of fog. Light SE winds in the morning, become S 15-25 KT afternoon and evening, with gusts up to 30 kt along the south coast. This should minimize LLWS, however the core of the low level jet may yield marginal LLWS 21z Sun to 03z Mon over southeast MA, WS020/18045KT.
Sunday night...high confidence on trends, lower on exact timing.
MVFR/IFR at 00z, but quickly improving to VFR with FROPA and the wind shift to the west 15-25 kt.
KBOS Terminal...High confidence in TAF through Sunday morning.
KBDL Terminal...High confidence in TAF through 12z Sunday, then some uncertainty on exact timing details.
Outlook /Monday through Wednesday/...
Sunday Night: Mainly VFR, with local MVFR possible. Breezy.
Chance RA, patchy BR.
Monday: VFR. Breezy.
Monday Night: VFR.
Tuesday: Mainly IFR, with areas MVFR possible. Breezy. RA, chance SN.
Tuesday Night: Mainly VFR, with local IFR possible. Windy with local gusts up to 30 kt. RA likely, chance SN.
Wednesday: VFR. Breezy.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
130 PM update...
Tonight through Sunday night...High confidence.
Gusty WNW winds diminish Saturday evening and overnight. Dry weather and good vsby prevail into Sunday morning. Then a warm front results in a period of rain from late Sunday morning into Sunday evening, with rain and fog limiting vsby to 1-3 miles at times. Light SE winds Sunday morning, become south in the afternoon and evening, increasing with gusts up to 30 kt. Then a cold front sweeps across the RI/MA waters later Sunday night, ushering in dry weather and a wind shift to the west, with speeds 15-25 kt.
Outlook /Monday through Wednesday/...
Sunday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Rain, patchy fog.
Monday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Tuesday: Winds less than 25 kt. Chance of rain. Local visibility 1 to 3 nm.
Tuesday Night: Strong winds with gusts up to 40 kt. Areas of rough seas. Rain likely.
Wednesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Rough seas up to 12 ft. Slight chance of rain.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 7 PM EST this evening for ANZ231>235-237-250-251-254>256.
Wind History for Borden Flats Light at Fall River, MA
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KGHG
Terminal Aerodrome Forecast (TAF) for KGHG
Wind History Graph: GHG
(wind in knots)
GEOS Local Image of north east
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