Boston Harbor Marine Forecast
| This Afternoon...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 2 To 3 Ft. |
| Tonight...Ne Winds 15 To 20 Kt With Gusts Up To 25 Kt. Waves 2 To 3 Ft. |
| Thu...Ne Winds 10 To 15 Kt. Gusts Up To 20 Kt In The Morning. Waves Around 2 Ft In The Morning, Then 1 Foot Or Less. At The Outer Harbor Entrance, Waves 2 To 4 Ft. |
| Thu Night...Se Winds 5 To 10 Kt, Becoming Sw After Midnight. Waves 1 Foot Or Less. |
| Fri And Fri Night...W Winds 5 To 10 Kt. Waves 1 Foot Or Less. |
| Sat Through Sun Night...Sw Winds 5 To 10 Kt. Waves 1 Foot Or Less. 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 217pm EDT Wednesday Oct 1 2025 Synopsis Despite full sunshine, today is a cooler day to go along with enhanced northeast winds. Gusts could reach as high as 40 mph across the Cape and Islands today. High surf and rip currents are expected today as southerly swells impact the coast. A cool and dry airmass tonight will favor a rather chilly night tonight except for the southeast coast. Above to well above normal temperatures are then expected by the weekend which 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 - Through Tonight 230pm Update: Key Messages: * Dry/quiet weather overnight * Chilly with lows ranging from upper 30s to low 50s 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 - Thursday and 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/low 40s with locally lower/higher temperatures over the high terrain and on The Cape/Islands respectively. Long Term - Friday Through Tuesday 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 the weekend into early next week, potentially into the mid 80s this weekend. Details: Global models/ensembles appear little changed from prior forecasts for this forecast period. The main story being a steady warm-up in temperatures to go along with several days of dry weather as high pressure remains anchored south of Southern New England. In fact we may see temperatures reach into the mid 80s in some locations this weekend, which are some 10-15 degrees warmer than normal. While winds are generally on the lighter-southerly side, the lack of rainfall, autumn leaf-drop and the warm temps and full sun could lead to elevated fire weather concerns. Our next chance for rainfall may not materialize until Wed, associated with a modeled strong cold front. Marine Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Marine Through Thursday night...High Confidence SCY 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 Sunday/... Thursday Night: Winds less than 25 kt. Local rough seas. Friday: Winds less than 25 kt. Areas of seas approaching 5 ft. Friday Night: Winds less than 25 kt. Seas up to 5 ft. Saturday: Winds less than 25 kt. Areas of seas approaching 5 ft. Saturday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Sunday: 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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