Marine Weather and Tide Forecast for West Chatham, MA
 | Sunrise 6:00 AM Sunset 7:21 PM Moonrise 4:51 AM Moonset 5:29 PM |
Marine Forecasts
NOTE: Zones were updated 3/20/2025. If your report is out of date, please click Edit
ANZ254 Coastal Waters From Provincetown Ma To Chatham Ma To Nantucket Ma Out 20 Nm- 702 Pm Edt Wed Apr 15 2026
Tonight - S winds 5 to 10 kt, becoming sw after midnight. Seas 2 to 3 ft. Patchy fog. A slight chance of tstms. A slight chance of showers this evening, then a chance of showers after midnight. Vsby 1 nm or less.
Thu - SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning with vsby 1 nm or less.
Thu night - SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog after midnight with vsby 1 nm or less.
Fri - SW winds 5 to 10 kt, becoming nw in the afternoon. Seas 2 to 4 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 nm or less in the morning.
Fri night and Sat - E winds 5 to 10 kt. Seas 2 to 3 ft.
Sat night - E winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft.
Sun - SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Showers likely.
Sun night - W winds 20 to 25 kt. Seas 3 to 5 ft. A chance of showers.
Mon and Mon night - NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft.
winds and seas higher in and near tstms.
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.
winds and seas higher in and near tstms.
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 702 Pm Edt Wed Apr 15 2026
Synopsis for massachusetts and rhode island coastal waters - A backdoor cold front remains over northern new england today, which may flirt with ma waters north of cape cod through Thu. A cold front likely crosses waters sometime Fri/fri night followed by a stronger cold front sometime Sun/sun night. Early next week, high pres builds from the great lakes to the mid atlantic.
7 Day Forecast for Marine Location Near West Chatham, MA
NEW! Add second zone forecast
| Pleasant Bay Click for Map Wed -- 12:20 AM EDT 3.27 feet High Tide Wed -- 04:51 AM EDT Moonrise Wed -- 05:59 AM EDT Sunrise Wed -- 07:30 AM EDT 0.12 feet Low Tide Wed -- 12:42 PM EDT 3.37 feet High Tide Wed -- 05:29 PM EDT Moonset Wed -- 07:20 PM EDT Sunset Wed -- 07:51 PM EDT 0.07 feet Low Tide Tide / Current data from XTide NOT FOR NAVIGATION |
Pleasant Bay, Cape Cod, Massachusetts, Tide feet
| 12 am |
| 3.2 |
| 1 am |
| 3.2 |
| 2 am |
| 2.9 |
| 3 am |
| 2.4 |
| 4 am |
| 1.8 |
| 5 am |
| 1.1 |
| 6 am |
| 0.5 |
| 7 am |
| 0.2 |
| 8 am |
| 0.2 |
| 9 am |
| 0.8 |
| 10 am |
| 1.6 |
| 11 am |
| 2.5 |
| 12 pm |
| 3.2 |
| 1 pm |
| 3.4 |
| 2 pm |
| 3.1 |
| 3 pm |
| 2.6 |
| 4 pm |
| 2 |
| 5 pm |
| 1.3 |
| 6 pm |
| 0.7 |
| 7 pm |
| 0.2 |
| 8 pm |
| 0.1 |
| 9 pm |
| 0.5 |
| 10 pm |
| 1.4 |
| 11 pm |
| 2.3 |
| Stage Harbor Click for Map Flood direction 335 true Ebb direction 144 true Wed -- 03:24 AM EDT -1.07 knots Max Ebb Wed -- 04:51 AM EDT Moonrise Wed -- 05:10 AM EDT 0.00 knots Slack Wed -- 05:59 AM EDT Sunrise Wed -- 06:52 AM EDT 0.59 knots Max Flood Wed -- 10:54 AM EDT -0.00 knots Slack Wed -- 03:41 PM EDT -1.11 knots Max Ebb Wed -- 05:26 PM EDT 0.00 knots Slack Wed -- 05:29 PM EDT Moonset Wed -- 07:10 PM EDT 0.64 knots Max Flood Wed -- 07:20 PM EDT Sunset Wed -- 11:18 PM EDT -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Stage Harbor, west of Morris Island, Nantucket Sound, Massachusetts Current, knots
| 12 am |
| -0.5 |
| 1 am |
| -0.8 |
| 2 am |
| -1 |
| 3 am |
| -1.1 |
| 4 am |
| -0.9 |
| 5 am |
| -0.2 |
| 6 am |
| 0.4 |
| 7 am |
| 0.6 |
| 8 am |
| 0.5 |
| 9 am |
| 0.4 |
| 10 am |
| 0.2 |
| 11 am |
| -0 |
| 12 pm |
| -0.4 |
| 1 pm |
| -0.7 |
| 2 pm |
| -1 |
| 3 pm |
| -1.1 |
| 4 pm |
| -1.1 |
| 5 pm |
| -0.4 |
| 6 pm |
| 0.3 |
| 7 pm |
| 0.6 |
| 8 pm |
| 0.6 |
| 9 pm |
| 0.5 |
| 10 pm |
| 0.3 |
| 11 pm |
| 0.1 |
FXUS61 KBOX 151735 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 135 PM EDT Wed Apr 15 2026
WHAT HAS CHANGED
No significant changes.
KEY MESSAGES
- Backdoor front brings cooling near coast but warmth continues inland through Friday.
- Rounds of showers and thunderstorms this afternoon, later tonight, and again Thursday night.
- Pattern turns cooler early next week.
DISCUSSION
KEY MESSAGE 1...Backdoor front brings cooling near coast but warmth continues inland through Friday.
Backdoor front dropping southward will bring cooler temperatures at least to eastern MA coast as winds turn onshore, but warmer temperatures will persist inland. Front itself should meander over southern New England for next couple of days, probably settling near a line from Fitchburg to Norwood and Plymouth later this afternoon, retreating back north overnight, then dropping back southward again Thursday afternoon to about the same location. This certainly presents a big challenge with the temperature forecast, less so in CT and western MA which are more likely to maintain summertime warmth through Friday, but less so across RI and eastern MA depending upon exactly where front ends up and with its timing.
KEY MESSAGE 2...Rounds of showers and thunderstorms this afternoon, later tonight, and again late Thursday.
As front remains over or near southern New England, a series of weak low pressure centers will ride along it, each bringing chances of showers and embedded thunderstorms.
First round through early tonight looks to be more scattered in nature per high-res guidance. Already seeing CU development upstream across central NY where instability is increasing so that is where convective initiation should take place.
Environment here will feature strong 0-6km shear and reasonably strong mid level lapse rates (6C/km) but best instability (1000 J/kg) is focused over western MA/CT which makes sense given that is the area to the west of the front. While we don't expect to see as much activity as we did Tuesday evening, there could still be a few storms between 4 PM and 8 PM, perhaps even a few hours later than that, capable of producing wind damage, especially in CT per HRRR helicity swaths.
Farther east in the cooler airmass, there is virtually no surface instability but perhaps enough instability aloft coupled with heating to pop up a few brief showers.
Next round of showers and embedded thunderstorms arrives during the overnight hours ahead of weak short wave and weak surface low riding along front. We still have strong 0-6km shear and decent mid level lapse rates approaching 7C/km, but instability is aloft and would support more in way of elevated thunder, not surface based, so overall severe threat is low.
Once low moves offshore, it should drop front southward Thu morning before it retreats northward again in afternoon. We then remain under large scale subsidence until next stronger short wave approaches Thu night. Environment remains about same with greatest instability west of I-91 but continued presence of strong 0-6km shear and decent mid level lapse rates of 6-7C/km. Guidance shows showers and thunderstorms forming to out west during the day, which arrives here Thu night and weakens as it does so.
KEY MESSAGE 3...Pattern turns cooler early next week.
It's been said all good things must come to an end, and for those who have been enjoying this early taste of summer, a brief pattern change will bring a return to much cooler weather early next week.
A strong cold front crosses southern New England Sun followed by a deep upper trough rotating through region, bringing an anomalously cold airmass back into the region, albeit for a short time. Temperatures aloft drop to as low as -7C to -10C at 850 mb Mon morning, only supporting highs in 40s and 50s Mon.
It might not be want you want but high pressure covering much of eastern U.S. eventually shifts offshore by midweek as upper flow becomes more zonal, allowing for a slow warming trend.
Highs should get back into 60s by Wed.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAFs: High confidence.
Backdoor cold front brings wind shift to E/NE and IFR/LIFR conditions along immediate eastern MA coast this afternoon. VFR farther inland with S/SW winds. Expecting scattered showers and thunderstorms from roughly 20z-00z, then a more widespread round of showers and embedded thunderstorms overnight with MVFR or IFR conditions.
Similar situation Thu. VFR inland with SW winds, and MVFR/IFR to start closer to coast with E/NE winds, but even these areas should improve to VFR Thu afternoon. Next round of scattered showers and thunderstorms should hold off until Thu night.
KBOS Terminal... High confidence in TAF.
KBDL Terminal... High confidence in TAF.
Outlook /Thursday Night through Monday/...
Friday: VFR. Chance SHRA, slight chance TSRA.
Friday Night through Saturday: Mainly VFR, with local MVFR possible.
Saturday Night: Mainly VFR, with local IFR possible. Breezy.
Slight chance SHRA.
Sunday: Mainly VFR, with local IFR possible. Breezy. SHRA likely.
Sunday Night: VFR. Breezy. Chance SHRA.
Monday: VFR. Breezy. Slight chance SHRA.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
High confidence through the weekend.
Backdoor front meandering over southern New England through Fri will maintain light winds and calm seas, though there will be wind shifts from SW to NE from time to time on eastern MA waters along with showers and embedded thunderstorms.
Passage of stronger cold Front Sun should bring SCA conditions to at least outer waters Sun into Mon.
Outlook /Thursday Night through Monday/...
Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.
Saturday: Winds less than 25 kt.
Saturday Night: Winds less than 25 kt. Slight chance of rain showers.
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Chance of rain showers.
Monday: Winds less than 25 kt. Local rough seas. Slight chance of rain showers.
CLIMATE
Today's record highs (April 15):
Boston 82 in 1896 Hartford 88 in 1941 Providence 82 in 1938 Worcester 85 in 1941
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 135 PM EDT Wed Apr 15 2026
WHAT HAS CHANGED
No significant changes.
KEY MESSAGES
- Backdoor front brings cooling near coast but warmth continues inland through Friday.
- Rounds of showers and thunderstorms this afternoon, later tonight, and again Thursday night.
- Pattern turns cooler early next week.
DISCUSSION
KEY MESSAGE 1...Backdoor front brings cooling near coast but warmth continues inland through Friday.
Backdoor front dropping southward will bring cooler temperatures at least to eastern MA coast as winds turn onshore, but warmer temperatures will persist inland. Front itself should meander over southern New England for next couple of days, probably settling near a line from Fitchburg to Norwood and Plymouth later this afternoon, retreating back north overnight, then dropping back southward again Thursday afternoon to about the same location. This certainly presents a big challenge with the temperature forecast, less so in CT and western MA which are more likely to maintain summertime warmth through Friday, but less so across RI and eastern MA depending upon exactly where front ends up and with its timing.
KEY MESSAGE 2...Rounds of showers and thunderstorms this afternoon, later tonight, and again late Thursday.
As front remains over or near southern New England, a series of weak low pressure centers will ride along it, each bringing chances of showers and embedded thunderstorms.
First round through early tonight looks to be more scattered in nature per high-res guidance. Already seeing CU development upstream across central NY where instability is increasing so that is where convective initiation should take place.
Environment here will feature strong 0-6km shear and reasonably strong mid level lapse rates (6C/km) but best instability (1000 J/kg) is focused over western MA/CT which makes sense given that is the area to the west of the front. While we don't expect to see as much activity as we did Tuesday evening, there could still be a few storms between 4 PM and 8 PM, perhaps even a few hours later than that, capable of producing wind damage, especially in CT per HRRR helicity swaths.
Farther east in the cooler airmass, there is virtually no surface instability but perhaps enough instability aloft coupled with heating to pop up a few brief showers.
Next round of showers and embedded thunderstorms arrives during the overnight hours ahead of weak short wave and weak surface low riding along front. We still have strong 0-6km shear and decent mid level lapse rates approaching 7C/km, but instability is aloft and would support more in way of elevated thunder, not surface based, so overall severe threat is low.
Once low moves offshore, it should drop front southward Thu morning before it retreats northward again in afternoon. We then remain under large scale subsidence until next stronger short wave approaches Thu night. Environment remains about same with greatest instability west of I-91 but continued presence of strong 0-6km shear and decent mid level lapse rates of 6-7C/km. Guidance shows showers and thunderstorms forming to out west during the day, which arrives here Thu night and weakens as it does so.
KEY MESSAGE 3...Pattern turns cooler early next week.
It's been said all good things must come to an end, and for those who have been enjoying this early taste of summer, a brief pattern change will bring a return to much cooler weather early next week.
A strong cold front crosses southern New England Sun followed by a deep upper trough rotating through region, bringing an anomalously cold airmass back into the region, albeit for a short time. Temperatures aloft drop to as low as -7C to -10C at 850 mb Mon morning, only supporting highs in 40s and 50s Mon.
It might not be want you want but high pressure covering much of eastern U.S. eventually shifts offshore by midweek as upper flow becomes more zonal, allowing for a slow warming trend.
Highs should get back into 60s by Wed.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18Z TAFs: High confidence.
Backdoor cold front brings wind shift to E/NE and IFR/LIFR conditions along immediate eastern MA coast this afternoon. VFR farther inland with S/SW winds. Expecting scattered showers and thunderstorms from roughly 20z-00z, then a more widespread round of showers and embedded thunderstorms overnight with MVFR or IFR conditions.
Similar situation Thu. VFR inland with SW winds, and MVFR/IFR to start closer to coast with E/NE winds, but even these areas should improve to VFR Thu afternoon. Next round of scattered showers and thunderstorms should hold off until Thu night.
KBOS Terminal... High confidence in TAF.
KBDL Terminal... High confidence in TAF.
Outlook /Thursday Night through Monday/...
Friday: VFR. Chance SHRA, slight chance TSRA.
Friday Night through Saturday: Mainly VFR, with local MVFR possible.
Saturday Night: Mainly VFR, with local IFR possible. Breezy.
Slight chance SHRA.
Sunday: Mainly VFR, with local IFR possible. Breezy. SHRA likely.
Sunday Night: VFR. Breezy. Chance SHRA.
Monday: VFR. Breezy. Slight chance SHRA.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
High confidence through the weekend.
Backdoor front meandering over southern New England through Fri will maintain light winds and calm seas, though there will be wind shifts from SW to NE from time to time on eastern MA waters along with showers and embedded thunderstorms.
Passage of stronger cold Front Sun should bring SCA conditions to at least outer waters Sun into Mon.
Outlook /Thursday Night through Monday/...
Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Friday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers.
Saturday: Winds less than 25 kt.
Saturday Night: Winds less than 25 kt. Slight chance of rain showers.
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
Chance of rain showers.
Sunday Night: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Local rough seas. Chance of rain showers.
Monday: Winds less than 25 kt. Local rough seas. Slight chance of rain showers.
CLIMATE
Today's record highs (April 15):
Boston 82 in 1896 Hartford 88 in 1941 Providence 82 in 1938 Worcester 85 in 1941
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| CHTM3 | 3 mi | 48 min | 48°F | 29.91 | ||||
| 44090 | 20 mi | 48 min | 50°F | 44°F | 1 ft | |||
| 44020 - NANTUCKET SOUND | 23 mi | 58 min | S 7.8G | 51°F | 47°F | 1 ft | 29.89 | |
| NTKM3 - 8449130 - Nantucket Island, MA | 31 mi | 48 min | SW 6G | 55°F | 53°F | 29.92 | ||
| WAXM3 - Waquoit Bay Reserve, MA | 31 mi | 93 min | SE 1.9 | 59°F | 29.86 | 54°F | ||
| BZBM3 - 8447930 - Woods Hole, MA | 40 mi | 48 min | 57°F | 49°F | 29.90 |
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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