Cape Cod Bay Marine Forecast
| Rest Of Tonight...Ne Winds 20 To 25 Kt With Gusts Up To 30 Kt. Seas 4 To 6 Ft. Wave Detail: N 6 Ft At 6 Seconds And Se 2 Ft At 14 Seconds. |
| Thu...Ne Winds 15 To 20 Kt, Diminishing To 10 To 15 Kt In The Afternoon. Gusts Up To 25 Kt. Seas 4 To 6 Ft, Subsiding To 2 To 4 Ft In The Afternoon. Wave Detail: N 5 Ft At 6 Seconds And Se 2 Ft At 13 Seconds, Becoming N 4 Ft At 6 Seconds And Se 2 Ft At 13 Seconds. |
| Thu Night...Ne Winds 5 To 10 Kt, Becoming Sw After Midnight. Seas 2 To 3 Ft. Wave Detail: N 3 Ft At 7 Seconds And S 1 Foot At 12 Seconds. |
| Fri...Sw Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Ne 2 Ft At 7 Seconds And N 1 Foot At 4 Seconds. |
| Fri Night Through Sat Night...Sw Winds 5 To 10 Kt. Seas Around 2 Ft. Wave Detail: Ne 2 Ft At 6 Seconds And Sw 1 Foot At 3 Seconds. |
| Sun Through Mon Night...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. Wave Detail: Sw 1 Foot At 2 Seconds And Se 1 Foot At 8 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. |
| Area Forecast Discussion National Weather Service Boston/Norton MA 753pm EDT Wednesday Oct 1 2025 Synopsis High surf and rip currents expected into Thursday as southerly swells impact the coast. A cool and dry airmass arrives tonight. Above to well above normal temperatures are then expected by this weekend, which then continues into early next week. Dry weather is expected to prevail through early next week, with our next chance for rainfall not anticipated until the middle of next week. Near Term - Until 6am Thursday Morning Key Messages: * Dry/quiet weather overnight * Chilly with lows ranging from upper 30s to low 50s No significant changes to the forecast this evening. Previous Discussion... High pressure builds over Canada builds southeast overnight. This will support dry/quiet weather across souther New England. Northeast winds associated with anti-cyclonic flow around the surface high positioned to our north will advect cooler air over the region. 925 hPa temps drop below 5C and are likely to translate to surface temps in the mid to upper 30s across the interior/high terrain and low to upper 40s across eastern MA. Temperatures will be more mild along the coast, especially on Cape Cod, in the upper 40s to low 50s. Some patchy frost possible for location that experience temperatures below 37 degrees. Short Term - 6am Thursday Morning Through Thursday Night 230PM Update Key Messages: * Still cooler than normal for Thurs (low to mid 60s highs), but full sun and easing northeast winds. * Cool/dry again Thursday night with northeast winds becoming south/southwesterly Thursday and Thursday night High pressure settles over the region tomorrow supporting abundant sunshine and dry weather. Temperatures will be below normal in the low to mid 60s. Winds remain steady out of the northeast around 10-15 mph for the first half of the day and gradually weaken as the afternoon progresses in response to a weakening pressure gradient. Dry/quiet weather persist into tomorrow night. Clear skies and light winds should support efficient radiational cooling which will result in another chilly evening with low temperatures generally in the upper 30s/lower 40s with locally lower/higher temperatures over the high terrain and on The Cape/Islands respectively. Long Term - Friday Through Wednesday Key Messages: * Protracted dry weather continues, with our next chance for rain not anticipated until the middle of next week. * Above to well above normal temps for this weekend into early next week, potentially into the mid 80s this weekend. Details: Latest guidance did not show much change from previous forecasts. Still expecting a high pressure to provide dry weather into at least the early part of next week. Temperatures still anticipated to be above normal this weekend into early next week as well. The lack of rainfall will only exacerbate fire weather concerns. Fortunately, not expecting winds to be very strong during this portion of the forecast. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Through Thursday night...High Confidence Small Craft Advisory conditions persist through most of tomorrow but with improving conditions as tropical systems well offshore continue to move east over The Atlantic ocean. 5 to 10 foot seas overnight with gusty, near gale force winds over the southeast waters. Winds should be sub- gale force everywhere by sunrise tomorrow. Winds and seas gradually diminish/subside through the day tomorrow before becoming more calm tomorrow night into Friday morning with high pressure dominating the coastal waters. Outlook /Friday through Monday/... Friday: Winds less than 25 kt. Seas locally approaching 5 ft. Friday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Saturday: Winds less than 25 kt. Seas locally approaching 5 ft. Saturday Night through Sunday: Winds less than 25 kt. Sunday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Monday: Winds less than 25 kt. NOAA Boston MA Office: Watches - Warnings - Advisories CT...None. MA...High Surf Advisory until 8pm EDT this evening for MAZ007-015- 016-019>024. RI...High Surf Advisory until 8pm EDT this evening for RIZ006>008. Marine Small Craft Advisory until 2am EDT Thursday for ANZ230-236. Gale Warning until 2am EDT Thursday for ANZ231>234. Small Craft Advisory until 2pm EDT Thursday for ANZ235-237- 251. Small Craft Advisory until 2am EDT Friday for ANZ250-256. Gale Warning until 5am EDT Thursday for ANZ254-255. |
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