Marine Weather and Tide Forecast for Dennis Port, MA
April 23, 2025 2:51 PM EDT (18:51 UTC) Change Location
 | Sunrise 5:46 AM Sunset 7:31 PM Moonrise 3:40 AM Moonset 2:35 PM |
ANZ232 Nantucket Sound- 103 Pm Edt Wed Apr 23 2025
This afternoon - SW winds 5 to 10 kt. Seas 1 foot or less. Wave detail: W 1 foot at 4 seconds and se 1 foot at 7 seconds.
Tonight - S winds 5 to 10 kt, becoming nw after midnight. Seas 1 foot or less. Wave detail: sw 1 foot at 3 seconds and se 1 foot at 7 seconds.
Thu - NE winds around 5 kt, becoming se in the afternoon. Seas 1 foot or less. Wave detail: sw 1 foot at 5 seconds and E 1 foot at 6 seconds.
Thu night - SW winds 5 to 10 kt. Seas 1 foot or less. Wave detail: S 1 foot at 3 seconds and se 1 foot at 9 seconds.
Fri - SW winds around 10 kt. Seas 1 foot or less. Wave detail: sw 1 foot at 3 seconds and se 1 foot at 10 seconds.
Fri night - S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave detail: sw 1 foot at 3 seconds and se 1 foot at 9 seconds, becoming S 2 ft at 3 seconds and se 1 foot at 10 seconds. A chance of showers after midnight.
Sat and Sat night - S winds 15 to 20 kt, becoming nw. Gusts up to 25 kt. Seas 2 to 4 ft. Showers. Vsby 1 to 3 nm.
Sun and Sun night - NW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 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 103 Pm Edt Wed Apr 23 2025
Synopsis for massachusetts and rhode island coastal waters - A dry cold front moves over the waters this morning with decreasing cloudiness. High pres then maintains control through Fri. Periodic chances for rainfall Fri through next weekend as low pressure crosses the region.
7 Day Forecast for Marine Location Near Dennis Port, MA
NEW! Add second zone forecast
| Dennis Port Click for Map Wed -- 02:13 AM EDT 0.54 feet Low Tide Wed -- 03:39 AM EDT Moonrise Wed -- 05:47 AM EDT Sunrise Wed -- 08:50 AM EDT 3.47 feet High Tide Wed -- 02:35 PM EDT Moonset Wed -- 02:48 PM EDT 0.19 feet Low Tide Wed -- 07:30 PM EDT Sunset Wed -- 09:29 PM EDT 3.39 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Dennis Port, Nantucket Sound, Massachusetts, Tide feet
| 12 am |
| 1.5 |
| 1 am |
| 0.9 |
| 2 am |
| 0.6 |
| 3 am |
| 0.7 |
| 4 am |
| 1.1 |
| 5 am |
| 1.7 |
| 6 am |
| 2.3 |
| 7 am |
| 2.9 |
| 8 am |
| 3.3 |
| 9 am |
| 3.5 |
| 10 am |
| 3.2 |
| 11 am |
| 2.5 |
| 12 pm |
| 1.8 |
| 1 pm |
| 1 |
| 2 pm |
| 0.4 |
| 3 pm |
| 0.2 |
| 4 pm |
| 0.5 |
| 5 pm |
| 1 |
| 6 pm |
| 1.7 |
| 7 pm |
| 2.4 |
| 8 pm |
| 3 |
| 9 pm |
| 3.3 |
| 10 pm |
| 3.3 |
| 11 pm |
| 2.9 |
| Pollock Rip Channel Click for Map Wed -- 03:06 AM EDT 1.61 knots Max Flood Wed -- 03:39 AM EDT Moonrise Wed -- 05:47 AM EDT Sunrise Wed -- 06:13 AM EDT -0.00 knots Slack Wed -- 08:54 AM EDT -1.58 knots Max Ebb Wed -- 12:01 PM EDT 0.00 knots Slack Wed -- 02:34 PM EDT Moonset Wed -- 03:32 PM EDT 1.95 knots Max Flood Wed -- 06:49 PM EDT -0.00 knots Slack Wed -- 07:29 PM EDT Sunset Wed -- 09:31 PM EDT -1.64 knots Max Ebb Tide / Current data from XTide NOT FOR NAVIGATION |
Pollock Rip Channel, Massachusetts Current, knots
| 12 am |
| 0.2 |
| 1 am |
| 0.9 |
| 2 am |
| 1.4 |
| 3 am |
| 1.6 |
| 4 am |
| 1.5 |
| 5 am |
| 1 |
| 6 am |
| 0.2 |
| 7 am |
| -0.7 |
| 8 am |
| -1.4 |
| 9 am |
| -1.6 |
| 10 am |
| -1.4 |
| 11 am |
| -0.8 |
| 12 pm |
| -0 |
| 1 pm |
| 0.9 |
| 2 pm |
| 1.5 |
| 3 pm |
| 1.9 |
| 4 pm |
| 1.9 |
| 5 pm |
| 1.6 |
| 6 pm |
| 0.8 |
| 7 pm |
| -0.2 |
| 8 pm |
| -1.1 |
| 9 pm |
| -1.6 |
| 10 pm |
| -1.6 |
| 11 pm |
| -1.2 |
FXUS61 KBOX 231750 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 150 PM EDT Wed Apr 23 2025
SYNOPSIS
Warm and dry today followed by a chilly night driven by radiational cooling. Rather mild and dry conditions continue with high pressure over New England to round out the end of the work week, though there is a low chance of a passing shower late Thursday evening/night for northern Massachusetts, majority of the region is dry. A system for Saturday brings the next chance for widespread rainfall, though exact details remain uncertainty. Drier conditions return late this weekend into early next week.
NEAR TERM /THROUGH TONIGHT/
Key Messages...
* Seasonable day with lots of sun and light winds.
* Chillier night tonight outside of the urban centers.
Quiet, zonal flow in the mid levels today with high pressure building at the surface will allow for a seasonable and quiet weather day. Relatively light NW winds continue through the daytime hours, 5-10 mph. These will become calm overnight as good radiational cooling conditions allow the boundary layer to decouple.
So, light winds and clear skies will allow locations outside of the typical urban corridors to cool into the upper 30s and low 40s.
SHORT TERM /THURSDAY/
Short Term
Key Messages...
* Warmer on Thursday with quiet and dry weather, save for the chance of a spot shower in NW MA in the evening.
A broad mid level ridge overhead together with surface high pressure just offshore will prolong the quiet and dry weather through Thursday. The only exception is for western and central MA which may be in close enough proximity to a weak shortwave and moisture plume to our north to support widely scattered showers Thursday evening.
Temperature-wise, we will warm a few degrees on Thursday as warm advection in the low levels pushes 925 mb temps up a few degrees closer to 12C which would result in highs in the upper 60s and mid 70s, cooler along the south coast.
LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/
Key Messages:
* Warm and mostly dry Friday, outside of a stray shower in northern Massachusetts Thursday evening/night.
* The next chance for widespread rain comes in Saturday, but there are uncertainties with the exact timing.
* Drier conditions Sunday into early next week.
The Big Picture: Nearly zonal flow at 500mb across the CONUS into Friday, a 850mb shortwave may produce a couple of spotty showers late Thursday evening into predawn Friday for those in far northern Massachusetts. Otherwise, dry on Friday with surface high pressure across New England. This feature moves northeast towards Nova Scotia ahead of the only soaking chance of rain for this part of the forecast, arriving Saturday. Behind the system, mid-level ridging, surface high pressure builds in from the northwest with drier conditions Sunday into Tuesday of next week.
Thursday Night to Friday Night: Weak shortwave rides the northern edge of the 850mb high, with the greatest forcing displaced to the north in northern New England. Cannot rule out a rouge shower for areas in northern Massachusetts, mainly along and north of Route 2.
Will have mild overnight lows in the 50s. Otherwise, dry conditions and increased cloud cover for Friday. Will be another warm day, as 850mb temperatures remain above normal +10C to +12C a quick look at BUFKIT and GFS and NAM show mixing Friday afternoon to 850mb. Highs Friday reach the mid-70s and for those in the CT River Valley may reach near 80F. At the coast it will be cooler do to the onshore wind/seabreeze given the time of year, and there the highs cooler in the low-60s, perhaps upper 50s for the Islands and outer Cape Cod.
Increasing clouds, becoming cloudy overnight ahead of the incoming system, will lead to a mild night in the 50s.
Saturday and Saturday Night: Broad northern stream mid-level trough moves across the northeast and development of a low-pressure system with a southerly LLJ. Will have anomolous PWATs advect into southern New England, 1.3" to 1.5", which is ~3 standard deviation above normal. There remains a uncertainty with respect to the exact timing of the onset and end time the rain, as mentioned previously, GFS is biased towards a more progressive outcome, continued to lean towards the slower solution which would bring rain in from west to east overnight with the steadiest through the day on Saturday, even rumbles of thunder cannot be ruled out with limited MUCAPE of a few hundred J/kg. A widespread soaking rain, modest probabilities for rainfall amounts greater than 0.5" across the region at 60 to 70 percent. Increase the potential rainfall to 1.0" or greater will have probabilites between 30 and 40 percent. WPC does have a low chance of excessive rainfall, placing all of southern New England under a marginal outlook. Will want to check back with us if you have outdoor plans for Saturday.
Sunday through Tuesday: Quiet weather to follow on Sunday, though it will be cooler, but features drying conditions as mid-level ridging and surface high pressure arrives. North-northeast flow Sunday lends to a cooler afternoon, highs in the upper-50s to low-60s. The flow becomes southwest Monday and Tuesday, bringing warmer temperatures in the upper-60s to low-70s on Monday, then low and middle 70s on Tuesday.
AVIATION /18Z WEDNESDAY THROUGH SUNDAY/
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAF Update:
Today through 00Z: High Confidence
VFR. W-NW winds 5-10kts with some sea breezes near the south coast and Cape.
Tonight: High Confidence
VFR. Northerly winds 5-10kts becoming light and variable in the early morning hours.
Thursday: High Confidence.
VFR. Winds light and variable, becoming southerly 5-10 kts in the afternoon.
Thursday Night: High Confidence.
VFR. Primarily SSWly winds 5-10kts with a few sporadic gusts up to 15kts.
KBOS TAF...High confidence in flight categories. Low confidence in sea breeze... chance it could come in later around 21-22Z.
Onshore flow/sea breezes likely Thursday.
KBDL TAF...High confidence in TAF.
Outlook /Thursday Night through Sunday/...
Thursday Night through Friday: VFR.
Friday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA.
Saturday: Mainly MVFR, with local IFR possible. Breezy. SHRA likely, isolated TSRA.
Saturday Night: VFR. Breezy. Chance SHRA.
Sunday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Today through Thursday...
A cold front crosses the waters early this morning resulting in a wind shift to the northwest. This will also help usher out any remaining fog/low stratus over the south coastal waters. High pressure builds in from the west today and will support calm conditions over the coastal waters through at least Thursday.
Outlook /Thursday Night through Sunday/...
Thursday Night through Friday: Winds less than 25 kt.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Saturday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Rain showers likely, isolated thunderstorms.
Saturday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers.
Sunday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 150 PM EDT Wed Apr 23 2025
SYNOPSIS
Warm and dry today followed by a chilly night driven by radiational cooling. Rather mild and dry conditions continue with high pressure over New England to round out the end of the work week, though there is a low chance of a passing shower late Thursday evening/night for northern Massachusetts, majority of the region is dry. A system for Saturday brings the next chance for widespread rainfall, though exact details remain uncertainty. Drier conditions return late this weekend into early next week.
NEAR TERM /THROUGH TONIGHT/
Key Messages...
* Seasonable day with lots of sun and light winds.
* Chillier night tonight outside of the urban centers.
Quiet, zonal flow in the mid levels today with high pressure building at the surface will allow for a seasonable and quiet weather day. Relatively light NW winds continue through the daytime hours, 5-10 mph. These will become calm overnight as good radiational cooling conditions allow the boundary layer to decouple.
So, light winds and clear skies will allow locations outside of the typical urban corridors to cool into the upper 30s and low 40s.
SHORT TERM /THURSDAY/
Short Term
Key Messages...
* Warmer on Thursday with quiet and dry weather, save for the chance of a spot shower in NW MA in the evening.
A broad mid level ridge overhead together with surface high pressure just offshore will prolong the quiet and dry weather through Thursday. The only exception is for western and central MA which may be in close enough proximity to a weak shortwave and moisture plume to our north to support widely scattered showers Thursday evening.
Temperature-wise, we will warm a few degrees on Thursday as warm advection in the low levels pushes 925 mb temps up a few degrees closer to 12C which would result in highs in the upper 60s and mid 70s, cooler along the south coast.
LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/
Key Messages:
* Warm and mostly dry Friday, outside of a stray shower in northern Massachusetts Thursday evening/night.
* The next chance for widespread rain comes in Saturday, but there are uncertainties with the exact timing.
* Drier conditions Sunday into early next week.
The Big Picture: Nearly zonal flow at 500mb across the CONUS into Friday, a 850mb shortwave may produce a couple of spotty showers late Thursday evening into predawn Friday for those in far northern Massachusetts. Otherwise, dry on Friday with surface high pressure across New England. This feature moves northeast towards Nova Scotia ahead of the only soaking chance of rain for this part of the forecast, arriving Saturday. Behind the system, mid-level ridging, surface high pressure builds in from the northwest with drier conditions Sunday into Tuesday of next week.
Thursday Night to Friday Night: Weak shortwave rides the northern edge of the 850mb high, with the greatest forcing displaced to the north in northern New England. Cannot rule out a rouge shower for areas in northern Massachusetts, mainly along and north of Route 2.
Will have mild overnight lows in the 50s. Otherwise, dry conditions and increased cloud cover for Friday. Will be another warm day, as 850mb temperatures remain above normal +10C to +12C a quick look at BUFKIT and GFS and NAM show mixing Friday afternoon to 850mb. Highs Friday reach the mid-70s and for those in the CT River Valley may reach near 80F. At the coast it will be cooler do to the onshore wind/seabreeze given the time of year, and there the highs cooler in the low-60s, perhaps upper 50s for the Islands and outer Cape Cod.
Increasing clouds, becoming cloudy overnight ahead of the incoming system, will lead to a mild night in the 50s.
Saturday and Saturday Night: Broad northern stream mid-level trough moves across the northeast and development of a low-pressure system with a southerly LLJ. Will have anomolous PWATs advect into southern New England, 1.3" to 1.5", which is ~3 standard deviation above normal. There remains a uncertainty with respect to the exact timing of the onset and end time the rain, as mentioned previously, GFS is biased towards a more progressive outcome, continued to lean towards the slower solution which would bring rain in from west to east overnight with the steadiest through the day on Saturday, even rumbles of thunder cannot be ruled out with limited MUCAPE of a few hundred J/kg. A widespread soaking rain, modest probabilities for rainfall amounts greater than 0.5" across the region at 60 to 70 percent. Increase the potential rainfall to 1.0" or greater will have probabilites between 30 and 40 percent. WPC does have a low chance of excessive rainfall, placing all of southern New England under a marginal outlook. Will want to check back with us if you have outdoor plans for Saturday.
Sunday through Tuesday: Quiet weather to follow on Sunday, though it will be cooler, but features drying conditions as mid-level ridging and surface high pressure arrives. North-northeast flow Sunday lends to a cooler afternoon, highs in the upper-50s to low-60s. The flow becomes southwest Monday and Tuesday, bringing warmer temperatures in the upper-60s to low-70s on Monday, then low and middle 70s on Tuesday.
AVIATION /18Z WEDNESDAY THROUGH SUNDAY/
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAF Update:
Today through 00Z: High Confidence
VFR. W-NW winds 5-10kts with some sea breezes near the south coast and Cape.
Tonight: High Confidence
VFR. Northerly winds 5-10kts becoming light and variable in the early morning hours.
Thursday: High Confidence.
VFR. Winds light and variable, becoming southerly 5-10 kts in the afternoon.
Thursday Night: High Confidence.
VFR. Primarily SSWly winds 5-10kts with a few sporadic gusts up to 15kts.
KBOS TAF...High confidence in flight categories. Low confidence in sea breeze... chance it could come in later around 21-22Z.
Onshore flow/sea breezes likely Thursday.
KBDL TAF...High confidence in TAF.
Outlook /Thursday Night through Sunday/...
Thursday Night through Friday: VFR.
Friday Night: Mainly VFR, with local IFR possible. Breezy.
Chance SHRA.
Saturday: Mainly MVFR, with local IFR possible. Breezy. SHRA likely, isolated TSRA.
Saturday Night: VFR. Breezy. Chance SHRA.
Sunday: VFR. Breezy.
MARINE
Forecaster Confidence Levels:
Low - less than 30 percent.
Medium - 30 to 60 percent.
High - greater than 60 percent.
Today through Thursday...
A cold front crosses the waters early this morning resulting in a wind shift to the northwest. This will also help usher out any remaining fog/low stratus over the south coastal waters. High pressure builds in from the west today and will support calm conditions over the coastal waters through at least Thursday.
Outlook /Thursday Night through Sunday/...
Thursday Night through Friday: Winds less than 25 kt.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers.
Saturday: Moderate risk for Small Craft Advisory winds with gusts up to 25 kt. Seas up to 5 ft. Rain showers likely, isolated thunderstorms.
Saturday Night: Winds less than 25 kt. Seas up to 5 ft. Chance of rain showers.
Sunday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Slight chance of rain showers.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| CHTM3 | 9 mi | 52 min | 53°F | 30.16 | ||||
| 44020 - NANTUCKET SOUND | 14 mi | 42 min | S 5.8G | 52°F | 48°F | 30.15 | 47°F | |
| 44090 | 17 mi | 52 min | 49°F | 48°F | 1 ft | |||
| NTKM3 - 8449130 - Nantucket Island, MA | 25 mi | 52 min | N 5.1G | 57°F | 53°F | 30.17 | ||
| BZBM3 - 8447930 - Woods Hole, MA | 30 mi | 52 min | 56°F | 49°F | 30.17 | |||
| NBGM3 | 42 mi | 52 min | SSW 14G | 58°F | 30.16 |
Wind History for Nantucket Island, MA
toggle option: (graph/table)
Link to 1 hour of 5 minute data for KCQX
Terminal Aerodrome Forecast (TAF) for KCQX
Wind History Graph: CQX
(wind in knots)
GEOS Local Image of north east
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Boston, MA,
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