Marine Weather and Tide Forecast for East Dennis, MA
 | Sunrise 6:16 AM Sunset 5:30 PM Moonrise 3:23 PM Moonset 5:52 AM |
Marine Forecasts
NOTE: Zones were updated 3/20/2025. If your report is out of date, please click Edit
ANZ231 Cape Cod Bay- 1006 Am Est Sat Feb 28 2026
This afternoon - S winds 5 to 10 kt. Seas around 2 ft. Wave detail: S 1 foot at 2 seconds and ne 1 foot at 4 seconds.
Tonight - SW winds around 5 kt, becoming nw after midnight. Seas 1 foot or less. Wave detail: sw 1 foot at 2 seconds and E 1 foot at 4 seconds. Patchy fog after midnight with vsby 1 to 3 nm.
Sun - N winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave detail: N 2 ft at 4 seconds and se 1 foot at 7 seconds. Patchy fog in the afternoon. Snow in the afternoon.
Sun night - NW winds 20 to 25 kt. Seas 2 to 3 ft. Wave detail: N 3 ft at 5 seconds and se 1 foot at 7 seconds. Snow likely in the evening.
Mon - NW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave detail: N 3 ft at 6 seconds and se 1 foot at 8 seconds.
Mon night - W winds 5 to 10 kt. Seas around 2 ft. Wave detail: N 2 ft at 5 seconds and E 1 foot at 9 seconds.
Tue - S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain.
Tue night and Wed - SW winds 20 to 25 kt, becoming nw 15 to 20 kt. Seas 2 to 4 ft. Rain.
Wed night - S winds 5 to 10 kt. Seas around 2 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 1006 Am Est Sat Feb 28 2026
Synopsis for massachusetts and rhode island coastal waters - High pres shifts E of the waters tonight into Sat. A strong cold front then crosses the waters Sat night. High pres then arrives over the waters for Mon. Low pres across nrn new england may push a front across the waters Tue night or Wed.
7 Day Forecast for Marine Location Near East Dennis, MA
NEW! Add second zone forecast
| Sesuit Harbor Click for Map Sat -- 01:59 AM EST 0.57 feet Low Tide Sat -- 04:52 AM EST Moonset Sat -- 06:16 AM EST Sunrise Sat -- 08:20 AM EST 10.70 feet High Tide Sat -- 02:23 PM EST Moonrise Sat -- 02:43 PM EST -0.41 feet Low Tide Sat -- 05:29 PM EST Sunset Sat -- 09:00 PM EST 9.41 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Sesuit Harbor, East Dennis, Cape Cod Bay, Massachusetts, Tide feet
| 12 am |
| 3.3 |
| 1 am |
| 1.3 |
| 2 am |
| 0.6 |
| 3 am |
| 1.3 |
| 4 am |
| 2.8 |
| 5 am |
| 4.8 |
| 6 am |
| 7.1 |
| 7 am |
| 9.4 |
| 8 am |
| 10.6 |
| 9 am |
| 10.4 |
| 10 am |
| 9.2 |
| 11 am |
| 7.3 |
| 12 pm |
| 4.8 |
| 1 pm |
| 2 |
| 2 pm |
| 0 |
| 3 pm |
| -0.4 |
| 4 pm |
| 0.5 |
| 5 pm |
| 2.1 |
| 6 pm |
| 4.2 |
| 7 pm |
| 6.7 |
| 8 pm |
| 8.7 |
| 9 pm |
| 9.4 |
| 10 pm |
| 8.9 |
| 11 pm |
| 7.7 |
| Barnstable Harbor (depth 7 ft) Click for Map Flood direction 192 true Ebb direction 4 true Sat -- 12:06 AM EST -1.13 knots Max Ebb Sat -- 02:07 AM EST 0.00 knots Slack Sat -- 04:52 AM EST Moonset Sat -- 05:41 AM EST 1.08 knots Max Flood Sat -- 06:17 AM EST Sunrise Sat -- 07:58 AM EST -0.00 knots Slack Sat -- 12:44 PM EST -1.58 knots Max Ebb Sat -- 02:24 PM EST Moonrise Sat -- 03:01 PM EST 0.00 knots Slack Sat -- 05:30 PM EST Sunset Sat -- 06:46 PM EST 1.18 knots Max Flood Sat -- 08:52 PM EST -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Barnstable Harbor (depth 7 ft), Cape Cod Bay, Massachusetts Current, knots
| 12 am |
| -1.1 |
| 1 am |
| -0.9 |
| 2 am |
| -0.1 |
| 3 am |
| 0.5 |
| 4 am |
| 0.9 |
| 5 am |
| 1.1 |
| 6 am |
| 1.1 |
| 7 am |
| 0.7 |
| 8 am |
| -0 |
| 9 am |
| -0.5 |
| 10 am |
| -0.8 |
| 11 am |
| -1.1 |
| 12 pm |
| -1.5 |
| 1 pm |
| -1.6 |
| 2 pm |
| -1.1 |
| 3 pm |
| -0 |
| 4 pm |
| 0.6 |
| 5 pm |
| 0.9 |
| 6 pm |
| 1.1 |
| 7 pm |
| 1.2 |
| 8 pm |
| 0.6 |
| 9 pm |
| -0.1 |
| 10 pm |
| -0.5 |
| 11 pm |
| -0.8 |
FXUS61 KBOX 281058 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 558 AM EST Sat Feb 28 2026
WHAT HAS CHANGED
Light snow remains possible Sunday, but confidence in total accumulation has decreased. Confidence is increasing that snow will change to a wintry mix and rain late Tuesday.
KEY MESSAGES
- Mild today, then turning very cold behind an arctic front Sunday
- Light snowfall remains possible Sunday with lower than normal confidence
- More seasonable temps return mid next week, along with more chances for wintry precipitation.
DISCUSSION
Key Message 1...Mild today, then turning very cold behind an arctic front Sunday
A warm front brings mild temperatures today, with 850 mb temps warming from -2C to +2C. Surface temperatures today will top out in the low 50s with southerly winds gusting 15-20mph. Guidance has trended skies more cloudy today, with mid- to high-level clouds streaming in with a weak shortwave late in the day. Moisture with this weak shortwave is extremely limited, so not anticipating any shower activity as it passes through the region late in the afternoon. The warm weather will be short-lived as an arctic front moves through Sunday, bringing high temperatures back into the 30s.
The core of the arctic air arrives Sunday night, with low temperatures dropping into the low single digits. Winds will be diminishing overnight Sunday; however, the wind chill index will likely be below zero across interior Southern New England. High temperatures on Monday will be quite cold for March standards, only topping out in the low to mid-20s. Arctic air remains in place Monday night with low temperatures once again bottoming out in the single digits. Little to no wind is expected Monday night, limiting the wind chill factor.
Key Message 2...Light snowfall remains possible Sunday with lower than normal confidence
The cold front on Sunday will also be accompanied by snow; however, an unusually wide spread in the guidance has reduced forecast confidence. Deterministic QPF ranges from a hundredth in the EURO to up to four tenths in the HRRR. Ensembles show similar spread, with the NBM 25th-75th percentile ranging from 0.01 to 0.25. The front will not have much moisture to work with, as guidance is generally in good agreement, with less than a half inch of precipitable water. Forcing also seems to be limited to the cold front itself, with the parent shortwave staying in northern New England. However, 850 mb FGEN may make up for the lack of upper- level forcing. Given these uncertainties, the snowfall forecast remains nearly unchanged, with a widespread trace to 1 inch expected across much of Southern New England, with a worst-case scenario of 2- 4 inches. The most likely spots to see the higher totals will be the high terrain across the northern Berkshires and Worcester hills.
Snow will move from west to east on Sunday, starting in the mid to late morning and moving offshore around sunset. Given the lack of stronger forcing, hourly snow rates will be light, under a half inch per hour.
Key Message 3... More seasonable temps return mid next week, along with more chances for wintry precipitation.
Temperatures begin to moderate to more seasonable levels on Tuesday, and possibly even back into the mid-40s by Wednesday and Thursday.
Long-range global guidance continues to advertise zonal and active patterns starting Tuesday and lasting through the end of the week.
The first system looks to arrive late Tuesday as a low-pressure system tracking through the Great Lakes pushes a warm front into the region. Given the cold air still in place on Tuesday, precipitation type is likely to start as snow, then switch to a wintry mix, and eventually rain. Precipitation chances are expected to continue into late next week as several weak shortwave impulses traverse the zonal flow.
AVIATION /12Z SATURDAY THROUGH WEDNESDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today...High Confidence.
MVFR Cloud deck expanding across western MA and CT will graduallylift this morning. Any fog that formed overnight will burn off by 13z.
VFR. Light SW-ly winds 5-10 knots. Increasing mid-level cloudiness into the afternoon.
Saturday Night...Moderate Confidence.
VFR with areas of MVFR and some IFR possible with fog development. Light winds shift more NW-ly.
Sunday...Moderate Confidence.
Generally MVFR cigs as the chance for some light snow showers increases throughout Sunday morning. Not expecting much accumulation with this system. Possibly up to 1-1.5 inches, but confidence is low given the wide spread in model guidance at this time. northerly winds at 10-15 knots.
KBOS Terminal...High confidence in TAF.
VFR. SW-ly winds 5-10 knots today veer NW-ly late tonight.
KBDL Terminal...Moderate confidence in TAF.
MVFR cloud deck slowly expanding across western CT should gradually lift through the morning. Otherwise VFR with light southerly winds today.
Outlook /Sunday Night through Wednesday/...
Sunday Night: VFR. Breezy. Slight chance SN.
Monday: VFR. Breezy.
Monday Night: VFR.
Tuesday: Mainly VFR, with local MVFR possible. Breezy. Chance RA, chance SN.
Tuesday Night: Mainly IFR, with areas MVFR possible. Windy with local gusts up to 30 kt. RA.
Wednesday: Mainly VFR, with local MVFR possible. Breezy. Chance RA.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Saturday Night...High confidence.
Winds generally below 15 knots, with the exception of the occasional gust up to 20 knots over the far northeast waters this afternoon. S to SE winds shift more N Saturday night into Sunday morning. Winds begin to increase to near 25 knots Sunday night into Monday morning, but seas remain below 5 feet.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Slight chance of snow.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.
Monday Night: Winds less than 25 kt.
Tuesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Chance of rain.
Tuesday Night: Strong winds with gusts up to 30 kt. Seas locally approaching 5 ft. Rain.
Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Rain likely.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 558 AM EST Sat Feb 28 2026
WHAT HAS CHANGED
Light snow remains possible Sunday, but confidence in total accumulation has decreased. Confidence is increasing that snow will change to a wintry mix and rain late Tuesday.
KEY MESSAGES
- Mild today, then turning very cold behind an arctic front Sunday
- Light snowfall remains possible Sunday with lower than normal confidence
- More seasonable temps return mid next week, along with more chances for wintry precipitation.
DISCUSSION
Key Message 1...Mild today, then turning very cold behind an arctic front Sunday
A warm front brings mild temperatures today, with 850 mb temps warming from -2C to +2C. Surface temperatures today will top out in the low 50s with southerly winds gusting 15-20mph. Guidance has trended skies more cloudy today, with mid- to high-level clouds streaming in with a weak shortwave late in the day. Moisture with this weak shortwave is extremely limited, so not anticipating any shower activity as it passes through the region late in the afternoon. The warm weather will be short-lived as an arctic front moves through Sunday, bringing high temperatures back into the 30s.
The core of the arctic air arrives Sunday night, with low temperatures dropping into the low single digits. Winds will be diminishing overnight Sunday; however, the wind chill index will likely be below zero across interior Southern New England. High temperatures on Monday will be quite cold for March standards, only topping out in the low to mid-20s. Arctic air remains in place Monday night with low temperatures once again bottoming out in the single digits. Little to no wind is expected Monday night, limiting the wind chill factor.
Key Message 2...Light snowfall remains possible Sunday with lower than normal confidence
The cold front on Sunday will also be accompanied by snow; however, an unusually wide spread in the guidance has reduced forecast confidence. Deterministic QPF ranges from a hundredth in the EURO to up to four tenths in the HRRR. Ensembles show similar spread, with the NBM 25th-75th percentile ranging from 0.01 to 0.25. The front will not have much moisture to work with, as guidance is generally in good agreement, with less than a half inch of precipitable water. Forcing also seems to be limited to the cold front itself, with the parent shortwave staying in northern New England. However, 850 mb FGEN may make up for the lack of upper- level forcing. Given these uncertainties, the snowfall forecast remains nearly unchanged, with a widespread trace to 1 inch expected across much of Southern New England, with a worst-case scenario of 2- 4 inches. The most likely spots to see the higher totals will be the high terrain across the northern Berkshires and Worcester hills.
Snow will move from west to east on Sunday, starting in the mid to late morning and moving offshore around sunset. Given the lack of stronger forcing, hourly snow rates will be light, under a half inch per hour.
Key Message 3... More seasonable temps return mid next week, along with more chances for wintry precipitation.
Temperatures begin to moderate to more seasonable levels on Tuesday, and possibly even back into the mid-40s by Wednesday and Thursday.
Long-range global guidance continues to advertise zonal and active patterns starting Tuesday and lasting through the end of the week.
The first system looks to arrive late Tuesday as a low-pressure system tracking through the Great Lakes pushes a warm front into the region. Given the cold air still in place on Tuesday, precipitation type is likely to start as snow, then switch to a wintry mix, and eventually rain. Precipitation chances are expected to continue into late next week as several weak shortwave impulses traverse the zonal flow.
AVIATION /12Z SATURDAY THROUGH WEDNESDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Today...High Confidence.
MVFR Cloud deck expanding across western MA and CT will graduallylift this morning. Any fog that formed overnight will burn off by 13z.
VFR. Light SW-ly winds 5-10 knots. Increasing mid-level cloudiness into the afternoon.
Saturday Night...Moderate Confidence.
VFR with areas of MVFR and some IFR possible with fog development. Light winds shift more NW-ly.
Sunday...Moderate Confidence.
Generally MVFR cigs as the chance for some light snow showers increases throughout Sunday morning. Not expecting much accumulation with this system. Possibly up to 1-1.5 inches, but confidence is low given the wide spread in model guidance at this time. northerly winds at 10-15 knots.
KBOS Terminal...High confidence in TAF.
VFR. SW-ly winds 5-10 knots today veer NW-ly late tonight.
KBDL Terminal...Moderate confidence in TAF.
MVFR cloud deck slowly expanding across western CT should gradually lift through the morning. Otherwise VFR with light southerly winds today.
Outlook /Sunday Night through Wednesday/...
Sunday Night: VFR. Breezy. Slight chance SN.
Monday: VFR. Breezy.
Monday Night: VFR.
Tuesday: Mainly VFR, with local MVFR possible. Breezy. Chance RA, chance SN.
Tuesday Night: Mainly IFR, with areas MVFR possible. Windy with local gusts up to 30 kt. RA.
Wednesday: Mainly VFR, with local MVFR possible. Breezy. Chance RA.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Saturday Night...High confidence.
Winds generally below 15 knots, with the exception of the occasional gust up to 20 knots over the far northeast waters this afternoon. S to SE winds shift more N Saturday night into Sunday morning. Winds begin to increase to near 25 knots Sunday night into Monday morning, but seas remain below 5 feet.
Outlook /Sunday Night through Wednesday/...
Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Areas of seas approaching 5 ft. Slight chance of snow.
Monday: Winds less than 25 kt. Seas locally approaching 5 ft.
Monday Night: Winds less than 25 kt.
Tuesday: Low risk for Small Craft Advisory winds with gusts up to 30 kt. Chance of rain.
Tuesday Night: Strong winds with gusts up to 30 kt. Seas locally approaching 5 ft. Rain.
Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft. Rain likely.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| 44090 | 11 mi | 72 min | 38°F | 34°F | ||||
| CHTM3 | 12 mi | 54 min | 30.13 | |||||
| 44020 - NANTUCKET SOUND | 19 mi | 42 min | SSE 9.7G | 41°F | 38°F | 30.11 | 34°F | |
| WAXM3 - Waquoit Bay Reserve, MA | 23 mi | 87 min | ESE 2.9 | 42°F | 30.12 | 25°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 31 mi | 54 min | 32°F | 30.15 | ||||
| NTKM3 - 8449130 - Nantucket Island, MA | 32 mi | 54 min | SE 8.9G | 36°F | 30.14 | |||
| NBGM3 | 40 mi | 54 min | WSW 8G | 30.17 | ||||
| 44013 - BOSTON 16 NM East of Boston, MA | 49 mi | 42 min | SSE 9.7G | 37°F | 37°F | 30.14 | 33°F |
Wind History for Nantucket Island, MA
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KHYA
Terminal Aerodrome Forecast (TAF) for KHYA
Wind History Graph: HYA
(wind in knots)
GEOS Local Image of north east
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Boston, MA,
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