Marine Weather and Tide Forecast for South Yarmouth, MA
 | Sunrise 7:02 AM Sunset 5:47 PM Moonrise 4:20 PM Moonset 4:03 AM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ232 Nantucket Sound- 703 Pm Edt Fri Oct 23 2026
.small craft advisory in effect until 2 am edt Saturday - .
Tonight - NE winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Wave detail: N 4 ft at 6 seconds.
Sat - N winds 5 to 10 kt. Seas 2 to 3 ft. Wave detail: ne 3 ft at 10 seconds and nw 1 foot at 4 seconds.
Sat night - NW winds around 5 kt. Seas 2 to 3 ft. Wave detail: E 2 ft at 12 seconds and nw 1 foot at 4 seconds.
Sun - NW winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. Wave detail: E 2 ft at 13 seconds and sw 1 foot at 4 seconds.
Sun night and Mon - SW winds 5 to 10 kt. Seas around 2 ft. Wave detail: sw 2 ft at 3 seconds and E 2 ft at 12 seconds.
Mon night - W winds around 10 kt, becoming nw 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave detail: nw 2 ft at 3 seconds and E 1 foot at 10 seconds.
Tue through Wed night - SE winds 15 to 20 kt with gusts up to 25 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 703 Pm Edt Fri Oct 23 2026
Synopsis for massachusetts and rhode island coastal waters - Post-tropical cyclone josephine continues to move east into the north atlantic, allowing strong high pressure to build across the southern new england waters. Rough seas will linger through today, with improving conditions tonight. High pressure brings light winds and favorable marine conditions Saturday and into early next week.
7 Day Forecast for Marine Location Near South Yarmouth, MA
NEW! Add second zone forecast
| South Yarmouth Click for Map Fri -- 04:03 AM EDT Moonset Fri -- 05:06 AM EDT 0.27 feet Low Tide Fri -- 07:02 AM EDT Sunrise Fri -- 11:24 AM EDT 2.79 feet High Tide Fri -- 04:19 PM EDT Moonrise Fri -- 05:31 PM EDT 0.22 feet Low Tide Fri -- 05:47 PM EDT Sunset Fri -- 11:44 PM EDT 2.82 feet High Tide Tide / Current data from XTide NOT FOR NAVIGATION |
South Yarmouth, Bass River, Nantucket Sound, Massachusetts, Tide feet
| 12 am |
| 2.6 |
| 1 am |
| 2.2 |
| 2 am |
| 1.6 |
| 3 am |
| 1 |
| 4 am |
| 0.5 |
| 5 am |
| 0.3 |
| 6 am |
| 0.4 |
| 7 am |
| 0.8 |
| 8 am |
| 1.3 |
| 9 am |
| 1.9 |
| 10 am |
| 2.5 |
| 11 am |
| 2.8 |
| 12 pm |
| 2.7 |
| 1 pm |
| 2.4 |
| 2 pm |
| 1.9 |
| 3 pm |
| 1.3 |
| 4 pm |
| 0.7 |
| 5 pm |
| 0.3 |
| 6 pm |
| 0.3 |
| 7 pm |
| 0.6 |
| 8 pm |
| 1.1 |
| 9 pm |
| 1.7 |
| 10 pm |
| 2.3 |
| 11 pm |
| 2.7 |
| Lewis Bay entrance channel Click for Map Flood direction 4 true Ebb direction 184 true Fri -- 02:38 AM EDT -1.35 knots Max Ebb Fri -- 04:03 AM EDT Moonset Fri -- 04:06 AM EDT 0.00 knots Slack Fri -- 05:42 AM EDT 1.03 knots Max Flood Fri -- 07:02 AM EDT Sunrise Fri -- 10:40 AM EDT -0.00 knots Slack Fri -- 03:04 PM EDT -1.43 knots Max Ebb Fri -- 04:20 PM EDT Moonrise Fri -- 04:35 PM EDT 0.00 knots Slack Fri -- 05:47 PM EDT Sunset Fri -- 06:04 PM EDT 1.00 knots Max Flood Fri -- 10:59 PM EDT -0.00 knots Slack Tide / Current data from XTide NOT FOR NAVIGATION |
Lewis Bay entrance channel, Nantucket Sound, Massachusetts Current, knots
| 12 am |
| -0.8 |
| 1 am |
| -1.2 |
| 2 am |
| -1.3 |
| 3 am |
| -1.3 |
| 4 am |
| -0.2 |
| 5 am |
| 0.8 |
| 6 am |
| 1 |
| 7 am |
| 1 |
| 8 am |
| 0.8 |
| 9 am |
| 0.6 |
| 10 am |
| 0.2 |
| 11 am |
| -0.2 |
| 12 pm |
| -0.7 |
| 1 pm |
| -1.1 |
| 2 pm |
| -1.3 |
| 3 pm |
| -1.4 |
| 4 pm |
| -0.8 |
| 5 pm |
| 0.4 |
| 6 pm |
| 1 |
| 7 pm |
| 1 |
| 8 pm |
| 0.8 |
| 9 pm |
| 0.6 |
| 10 pm |
| 0.3 |
| 11 pm |
| -0 |
FXUS61 KBOX 232326 AFDBOX
Area Forecast Discussion National Weather Service Boston/Norton MA 726 PM EDT Fri Oct 23 2026
WHAT HAS CHANGED
No significant changes have been made to the forecast.
KEY MESSAGES
- Dry weather through the weekend with chilly/frosty nights and sunny/mild afternoons. Lows mainly in the 20s & 30s with highs in the upper 50s-lower 60s Sat and well into the 60s Sun.
- High pressure dominates through next week bringing plenty of sunny days and cooler nights.
DISCUSSION
KEY MESSAGE 1...Dry weather through the weekend with chilly/frosty nights and sunny/mild afternoons. Lows mainly in the 20s & 30s with highs in the upper 50s-lower 60s Sat and well into the 60s Sun.
Distant offshore ocean storm will continue to lift NE and move further way losing its grip on our region. Lingering gusty winds across the Cape/Islands will diminish early this evening.
Otherwise...a large 1035+ mb high pressure system will build overhead from the west through the weekend. The result will be mainly clear skies with chilly/frosty nights and mild sunny afternoons. Excellent radiational cooling conditions will allow for lows to drop into the 20s across the normally colder outlying locations with mainly 30s elsewhere. Meanwhile the Urban Heat Island of Boston will probably not drop below 40. Highs Sat will recover nicely into the upper 50s and lower 60s and well into the 60s Sun.
Winds will also be rather light resulting in comfortable afternoons for the latter half of October.
KEY MESSAGE 2...High pressure dominates through next week, bringing plenty of sunny days and cooler nights.
Strong high pressure will prevail across New England for most of next week. Mostly sunny skies, dry conditions, and mostly calm winds are expected for a majority of the week, leading to good radiational cooling most nights. Day time temperatures are likely to remain in the upper 50s to mid 60s and nighttime temps generally in the low to mid 30s for most of southern New England.
Two exceptions to the pleasant conditions: a weak cold front drops into the region Tuesday, leading to some gusty winds Tuesday afternoon/evening along the Cape/Islands/SE MA and cooler temperatures behind the front on Wednesday (likely in the low 50s).
This front looks to be moisture-starved and not likely to produce any showers at this time.
A second cold front looks to sweep through sometime Thursday night/early Friday morning, bringing some slightly increased PoPs (10-20) to portions of SNE.
AVIATION /00Z SATURDAY THROUGH WEDNESDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
00z TAF Update...High confidence.
VFR conditions continue through the weekend. Calm winds to less than 5 kts increase to 5-10 kts around daybreak. Couple hours of upper lever cirrus possible tonight with SKC returning by sunrise.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Monday through Wednesday/...
Monday: VFR.
Monday Night through Tuesday: VFR. Breezy.
Tuesday Night through Wednesday: VFR.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Sunday...High confidence.
Lingering NE wind gusts of 20-30 knots across our eastern waters diminish this evening as distant offshore low pressure system loses its grip our region
Otherwise
a large high pressure system builds in from the west across our waters this weekend. Seas will continue to diminish...but lingering swell will keep some marginal sca seas into our southeastern most waters into Sat evening. After that time...all of our waters will have finally dropped below small craft advisory criteria.
Outlook /Monday through Wednesday/...
Monday: Winds less than 25 kt.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Tuesday: Low risk for Small Craft Advisory winds with gusts up to 20 kt. Seas up to 5 ft.
Tuesday Night: Winds less than 25 kt. Seas up to 5 ft.
Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 AM EDT Saturday for ANZ231-232- 251.
Small Craft Advisory until 8 PM EDT Saturday for ANZ250.
Small Craft Advisory until 6 AM EDT Sunday for ANZ254-255.
Small Craft Advisory until 8 AM EDT Saturday for ANZ256.
Area Forecast Discussion National Weather Service Boston/Norton MA 726 PM EDT Fri Oct 23 2026
WHAT HAS CHANGED
No significant changes have been made to the forecast.
KEY MESSAGES
- Dry weather through the weekend with chilly/frosty nights and sunny/mild afternoons. Lows mainly in the 20s & 30s with highs in the upper 50s-lower 60s Sat and well into the 60s Sun.
- High pressure dominates through next week bringing plenty of sunny days and cooler nights.
DISCUSSION
KEY MESSAGE 1...Dry weather through the weekend with chilly/frosty nights and sunny/mild afternoons. Lows mainly in the 20s & 30s with highs in the upper 50s-lower 60s Sat and well into the 60s Sun.
Distant offshore ocean storm will continue to lift NE and move further way losing its grip on our region. Lingering gusty winds across the Cape/Islands will diminish early this evening.
Otherwise...a large 1035+ mb high pressure system will build overhead from the west through the weekend. The result will be mainly clear skies with chilly/frosty nights and mild sunny afternoons. Excellent radiational cooling conditions will allow for lows to drop into the 20s across the normally colder outlying locations with mainly 30s elsewhere. Meanwhile the Urban Heat Island of Boston will probably not drop below 40. Highs Sat will recover nicely into the upper 50s and lower 60s and well into the 60s Sun.
Winds will also be rather light resulting in comfortable afternoons for the latter half of October.
KEY MESSAGE 2...High pressure dominates through next week, bringing plenty of sunny days and cooler nights.
Strong high pressure will prevail across New England for most of next week. Mostly sunny skies, dry conditions, and mostly calm winds are expected for a majority of the week, leading to good radiational cooling most nights. Day time temperatures are likely to remain in the upper 50s to mid 60s and nighttime temps generally in the low to mid 30s for most of southern New England.
Two exceptions to the pleasant conditions: a weak cold front drops into the region Tuesday, leading to some gusty winds Tuesday afternoon/evening along the Cape/Islands/SE MA and cooler temperatures behind the front on Wednesday (likely in the low 50s).
This front looks to be moisture-starved and not likely to produce any showers at this time.
A second cold front looks to sweep through sometime Thursday night/early Friday morning, bringing some slightly increased PoPs (10-20) to portions of SNE.
AVIATION /00Z SATURDAY THROUGH WEDNESDAY/
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
00z TAF Update...High confidence.
VFR conditions continue through the weekend. Calm winds to less than 5 kts increase to 5-10 kts around daybreak. Couple hours of upper lever cirrus possible tonight with SKC returning by sunrise.
KBOS Terminal...High confidence in TAF.
KBDL Terminal...High confidence in TAF.
Outlook /Monday through Wednesday/...
Monday: VFR.
Monday Night through Tuesday: VFR. Breezy.
Tuesday Night through Wednesday: VFR.
MARINE
Forecaster Confidence Levels...
Low - less than 30 percent.
Moderate - 30 to 60 percent.
High - greater than 60 percent.
Tonight through Sunday...High confidence.
Lingering NE wind gusts of 20-30 knots across our eastern waters diminish this evening as distant offshore low pressure system loses its grip our region
Otherwise
a large high pressure system builds in from the west across our waters this weekend. Seas will continue to diminish...but lingering swell will keep some marginal sca seas into our southeastern most waters into Sat evening. After that time...all of our waters will have finally dropped below small craft advisory criteria.
Outlook /Monday through Wednesday/...
Monday: Winds less than 25 kt.
Monday Night: Winds less than 25 kt. Seas locally approaching 5 ft.
Tuesday: Low risk for Small Craft Advisory winds with gusts up to 20 kt. Seas up to 5 ft.
Tuesday Night: Winds less than 25 kt. Seas up to 5 ft.
Wednesday: Winds less than 25 kt. Areas of seas approaching 5 ft.
BOX WATCHES/WARNINGS/ADVISORIES
CT...None.
MA...None.
RI...None.
MARINE...Small Craft Advisory until 2 AM EDT Saturday for ANZ231-232- 251.
Small Craft Advisory until 8 PM EDT Saturday for ANZ250.
Small Craft Advisory until 6 AM EDT Sunday for ANZ254-255.
Small Craft Advisory until 8 AM EDT Saturday for ANZ256.
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| 44020 - NANTUCKET SOUND | 11 mi | 26 min | NE 14G | 51°F | 2 ft | 30.36 | ||
| 44090 | 15 mi | 76 min | 51°F | 56°F | 3 ft | |||
| WAXM3 - Waquoit Bay Reserve, MA | 18 mi | 46 min | NW 1 | 41°F | 30.39 | 37°F | ||
| NTKM3 - 8449130 - Nantucket Island, MA | 25 mi | 46 min | N 9.9G | 50°F | 54°F | 30.39 | ||
| BZBM3 - 8447930 - Woods Hole, MA | 26 mi | 46 min | 47°F | 57°F | 30.40 | |||
| NBGM3 | 37 mi | 46 min | E 1.9G | 48°F | 30.41 | |||
| 44085 | 47 mi | 46 min | 52°F | 59°F | 2 ft | |||
| BUZM3 - Buzzards Bay, MA | 47 mi | 46 min | NE 9.9G | 30.41 |
Wind History for Nantucket Island, MA
toggle option: (graph/table)
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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