Marine Weather and Tide Forecast for West Yarmouth, MA
 | Sunrise 5:39 AM Sunset 7:54 PM Moonrise 11:04 PM Moonset 1:11 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ232 Nantucket Sound- 104 Pm Edt Wed Aug 5 2026
This afternoon - SW winds 5 to 10 kt. Seas around 2 ft. Wave detail: sw 1 foot at 3 seconds and S 1 foot at 7 seconds.
Tonight - SW winds around 10 kt. Seas around 2 ft. Wave detail: sw 1 foot at 3 seconds and se 1 foot at 7 seconds.
Thu - SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave detail: sw 2 ft at 3 seconds and se 1 foot at 7 seconds.
Thu night - SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave detail: sw 2 ft at 3 seconds and S 1 foot at 6 seconds. Patchy fog in the evening with vsby 1 to 3 nm.
Fri and Fri night - SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave detail: W 2 ft at 3 seconds and S 1 foot at 6 seconds.
Sat through Sun night - W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave detail: sw 3 ft at 5 seconds and se 1 foot at 9 seconds.
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 Edt Wed Aug 5 2026
Synopsis for massachusetts and rhode island coastal waters - High pres builds today over the western atl ocean and lingers through the weekend leading to prolonged southwest winds across the coastal waters.
7 Day Forecast for Marine Location Near West Yarmouth, MA
NEW! Add second zone forecast
| Hyannis Port Click for Map Wed -- 05:37 AM EDT 3.12 feet High Tide Wed -- 05:39 AM EDT Sunrise Wed -- 11:15 AM EDT 0.59 feet Low Tide Wed -- 01:11 PM EDT Moonset Wed -- 05:56 PM EDT 3.84 feet High Tide Wed -- 07:54 PM EDT Sunset Wed -- 10:22 PM EDT Last Quarter Wed -- 11:04 PM EDT Moonrise Tide / Current data from XTide NOT FOR NAVIGATION |
Hyannis Port, Nantucket Sound, Massachusetts, Tide feet
| 12 am |
| 0.7 |
| 1 am |
| 1.2 |
| 2 am |
| 1.8 |
| 3 am |
| 2.3 |
| 4 am |
| 2.7 |
| 5 am |
| 3 |
| 6 am |
| 3.1 |
| 7 am |
| 2.8 |
| 8 am |
| 2.3 |
| 9 am |
| 1.7 |
| 10 am |
| 1 |
| 11 am |
| 0.6 |
| 12 pm |
| 0.8 |
| 1 pm |
| 1.4 |
| 2 pm |
| 2.1 |
| 3 pm |
| 2.8 |
| 4 pm |
| 3.3 |
| 5 pm |
| 3.7 |
| 6 pm |
| 3.8 |
| 7 pm |
| 3.6 |
| 8 pm |
| 3 |
| 9 pm |
| 2.3 |
| 10 pm |
| 1.4 |
| 11 pm |
| 0.7 |
| Point Gammon Click for Map Flood direction 105 true Ebb direction 260 true Wed -- 12:15 AM EDT 0.99 knots Max Flood Wed -- 03:46 AM EDT -0.00 knots Slack Wed -- 05:39 AM EDT Sunrise Wed -- 06:23 AM EDT -1.08 knots Max Ebb Wed -- 09:38 AM EDT 0.00 knots Slack Wed -- 12:38 PM EDT 0.98 knots Max Flood Wed -- 01:11 PM EDT Moonset Wed -- 04:10 PM EDT -0.00 knots Slack Wed -- 06:48 PM EDT -1.08 knots Max Ebb Wed -- 07:53 PM EDT Sunset Wed -- 10:06 PM EDT 0.00 knots Slack Wed -- 10:22 PM EDT Last Quarter Wed -- 11:04 PM EDT Moonrise Tide / Current data from XTide NOT FOR NAVIGATION |
Point Gammon, 1.2 mi south of, Nantucket Sound, Massachusetts Current, knots
| 12 am |
| 1 |
| 1 am |
| 0.9 |
| 2 am |
| 0.7 |
| 3 am |
| 0.4 |
| 4 am |
| -0.1 |
| 5 am |
| -0.7 |
| 6 am |
| -1.1 |
| 7 am |
| -1 |
| 8 am |
| -0.7 |
| 9 am |
| -0.3 |
| 10 am |
| 0.2 |
| 11 am |
| 0.6 |
| 12 pm |
| 0.9 |
| 1 pm |
| 1 |
| 2 pm |
| 0.8 |
| 3 pm |
| 0.5 |
| 4 pm |
| 0.1 |
| 5 pm |
| -0.5 |
| 6 pm |
| -1 |
| 7 pm |
| -1.1 |
| 8 pm |
| -0.9 |
| 9 pm |
| -0.5 |
| 10 pm |
| -0.1 |
| 11 pm |
| 0.4 |
FXUS61 KBOX 051722 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 122 PM EDT Wed Aug 5 2026
WHAT HAS CHANGED
Confidence continues to increase in southern New England seeing a prolonged period of high heat and humidity through the second half of the week and into the weekend.
KEY MESSAGES
- Generally dry today with increasing humidity. Low risk for early morning showers across the Islands.
- Summer heat and humidity returns Thursday through the weekend with chances for diurnal scattered thunderstorms possible each day.
DISCUSSION
KEY MESSAGE 1...Generally dry today with increasing humidity.
Low risk for early morning showers across the Islands.
A weak high pressure over western CT has brought mostly clear skies and calm winds to southern New England, leading to a little bit of river valley fog and dropping temperatures to around 60 across the usual radiator sites. A weak low pressure system has spun up over our southern waters tonight, leading to some scattered showers forming over the far southeastern waters, and there remains a low chance for those showers to push inland towards Nantucket through the early morning hours.
The high pressure should linger near NYC today, leading to generally dry conditions for most of southern New England. The low will slowly meander further east and offshore today as well.
Once the low moves out to sea, winds will become predominately southerly, pushing warm, moist air onshore and dewpoints will begin to slowly tick up throughout today... likely approaching 70 by this evening. Otherwise, temperatures today remain in the mid to upper 80s with plenty of sunshine.
KEY MESSAGE 2...Summer heat and humidity returns Thursday through the weekend with chances for diurnal scattered thunderstorms possible each day.
A Bermuda high will begin to build in across the western Atlantic Ocean and as southerly flow continues through the night, dew points begin to surge into the mid to upper 70s by Thursday. 925 mb temps surge to near +22C each afternoon this week, leading to high temps near 90 Thursday through Saturday.
Combined with near oppressive dew points of 72-76, "feels like" temperatures will climb to the upper 90s, possibly near 100 at times. Heat headlines are being considered through the second half of the week and possibly into the weekend; however, some uncertainty remains in exactly how hot southern New England could get with daily threats for diurnal thunderstorms.
Regarding the thunderstorm potential later in the week... a few weak, upper level disturbances passing through New England combining with the high heat/humidity and just enough instability will likely be enough to pop a few diurnal showers/thunderstorms each day Thursday through the weekend, with greatest chances across the interior on Thursday. Any thunderstorms that do pop have the potential to produce frequent lightning, gusty winds, and torrential downpours as PWATs will likely be around 2.0". Given the amount of rain southern New England has seen over the last week or so, any heavy downpours could lead to localized flooding.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update:
Tonight...High Confidence.
Generally VFR. Increasing moisture tonight should result in MVFR/IFR CIGS, especially across the southern coastal areas and the Cape. May also see a few -SHRA develop prior to 12z Thursday across CT. Most MVFR/IFR CIGS mix out after 12-14z Thurs.
Thursday...High Confidence.
Mix of VFR with MVFR cigs for western terminals early, becoming VFR. Chance for -SHRA and -TSRA across western terminals well after 18z. SW winds 5-10 kts.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Thursday Night through Monday/...
Thursday Night: VFR.
Friday: VFR. Breezy. Chance SHRA, slight chance TSRA.
Friday Night: VFR. Chance SHRA, slight chance TSRA.
Saturday: VFR. Breezy. Chance SHRA, chance TSRA.
Saturday Night: VFR. Breezy. Slight chance SHRA, slight chance TSRA.
Sunday: VFR. Breezy.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Thursday... High Confidence.
Conditions generally below SCA levels through Thursday as a broad high pressure system sets up over the western Atlantic. A few periods of gusty SW winds near 20 kts are possible tonight across the northeastern waters and Thursday across the southern waters.
Outlook /Thursday Night through Monday/...
Thursday Night through Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.
Saturday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Saturday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
Area Forecast Discussion National Weather Service Boston/Norton MA 122 PM EDT Wed Aug 5 2026
WHAT HAS CHANGED
Confidence continues to increase in southern New England seeing a prolonged period of high heat and humidity through the second half of the week and into the weekend.
KEY MESSAGES
- Generally dry today with increasing humidity. Low risk for early morning showers across the Islands.
- Summer heat and humidity returns Thursday through the weekend with chances for diurnal scattered thunderstorms possible each day.
DISCUSSION
KEY MESSAGE 1...Generally dry today with increasing humidity.
Low risk for early morning showers across the Islands.
A weak high pressure over western CT has brought mostly clear skies and calm winds to southern New England, leading to a little bit of river valley fog and dropping temperatures to around 60 across the usual radiator sites. A weak low pressure system has spun up over our southern waters tonight, leading to some scattered showers forming over the far southeastern waters, and there remains a low chance for those showers to push inland towards Nantucket through the early morning hours.
The high pressure should linger near NYC today, leading to generally dry conditions for most of southern New England. The low will slowly meander further east and offshore today as well.
Once the low moves out to sea, winds will become predominately southerly, pushing warm, moist air onshore and dewpoints will begin to slowly tick up throughout today... likely approaching 70 by this evening. Otherwise, temperatures today remain in the mid to upper 80s with plenty of sunshine.
KEY MESSAGE 2...Summer heat and humidity returns Thursday through the weekend with chances for diurnal scattered thunderstorms possible each day.
A Bermuda high will begin to build in across the western Atlantic Ocean and as southerly flow continues through the night, dew points begin to surge into the mid to upper 70s by Thursday. 925 mb temps surge to near +22C each afternoon this week, leading to high temps near 90 Thursday through Saturday.
Combined with near oppressive dew points of 72-76, "feels like" temperatures will climb to the upper 90s, possibly near 100 at times. Heat headlines are being considered through the second half of the week and possibly into the weekend; however, some uncertainty remains in exactly how hot southern New England could get with daily threats for diurnal thunderstorms.
Regarding the thunderstorm potential later in the week... a few weak, upper level disturbances passing through New England combining with the high heat/humidity and just enough instability will likely be enough to pop a few diurnal showers/thunderstorms each day Thursday through the weekend, with greatest chances across the interior on Thursday. Any thunderstorms that do pop have the potential to produce frequent lightning, gusty winds, and torrential downpours as PWATs will likely be around 2.0". Given the amount of rain southern New England has seen over the last week or so, any heavy downpours could lead to localized flooding.
AVIATION /18Z WEDNESDAY THROUGH MONDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
18z TAF Update:
Tonight...High Confidence.
Generally VFR. Increasing moisture tonight should result in MVFR/IFR CIGS, especially across the southern coastal areas and the Cape. May also see a few -SHRA develop prior to 12z Thursday across CT. Most MVFR/IFR CIGS mix out after 12-14z Thurs.
Thursday...High Confidence.
Mix of VFR with MVFR cigs for western terminals early, becoming VFR. Chance for -SHRA and -TSRA across western terminals well after 18z. SW winds 5-10 kts.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Thursday Night through Monday/...
Thursday Night: VFR.
Friday: VFR. Breezy. Chance SHRA, slight chance TSRA.
Friday Night: VFR. Chance SHRA, slight chance TSRA.
Saturday: VFR. Breezy. Chance SHRA, chance TSRA.
Saturday Night: VFR. Breezy. Slight chance SHRA, slight chance TSRA.
Sunday: VFR. Breezy.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Through Thursday... High Confidence.
Conditions generally below SCA levels through Thursday as a broad high pressure system sets up over the western Atlantic. A few periods of gusty SW winds near 20 kts are possible tonight across the northeastern waters and Thursday across the southern waters.
Outlook /Thursday Night through Monday/...
Thursday Night through Friday: Winds less than 25 kt. Seas locally approaching 5 ft.
Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.
Saturday: Winds less than 25 kt. Areas of seas approaching 5 ft.
Saturday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers.
Sunday: Winds less than 25 kt. Seas locally approaching 5 ft.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...None.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| 44020 - NANTUCKET SOUND | 7 mi | 44 min | SSW 14G | 74°F | 74°F | 30.14 | ||
| WAXM3 - Waquoit Bay Reserve, MA | 14 mi | 194 min | SW 1.9 | 81°F | 30.15 | 65°F | ||
| 44090 | 17 mi | 194 min | 72°F | 68°F | ||||
| 44085 | 43 mi | 194 min | 71°F | 68°F | 3 ft | |||
| BUZM3 - Buzzards Bay, MA | 43 mi | 74 min | SW 12G | 30.18 |
Wind History for Nantucket Island, MA
toggle option: (graph/table)
| Airport | Dist | Age | Wind kt | Vis | Sky | Weather | Air | DewPt | RH | inHg |
| KHYA Cape Cod Gateway Airport US | 5 sm | 17 min | SW 12 | 10 sm | Clear | 82°F | 59°F | 45% | 30.14 | |
| KFMH Cape Cod Coast Guard Air Station US | 14 sm | 17 min | SW 13 | 10 sm | Clear | 81°F | 63°F | 54% | 30.17 | |
| KCQX Chatham Municipal Airport US | 16 sm | 21 min | var 03G15 | 10 sm | Clear | 82°F | 68°F | 62% | 30.16 | |
| KMVY Martha's Vineyard Airport US | 23 sm | 20 min | SSW 10 | 10 sm | Clear | 30.16 |
Link to 5 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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