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Portsmouth, RI Marine Weather Forecast

Today - 43°F
Dec 20, 2025
8 to 13 mph W
Mostly Sunny
Mostly sunny, with a high near 43. West wind 8 to 13 mph, with gusts as high as 26 mph.
Tonight - 35°F
Dec 20, 2025
10 to 21 mph SW
Mostly Cloudy
Mostly cloudy. Low around 35, with temperatures rising to around 43 overnight. Southwest wind 10 to 21 mph.
Sunday - 45°F
Dec 21, 2025
18 mph W
Mostly Sunny
Mostly sunny. High near 45, with temperatures falling to around 38 in the afternoon. West wind around 18 mph.
Sunday Night - 26°F
Dec 21, 2025
18 mph NW
Mostly Clear
Mostly clear, with a low around 26. Northwest wind around 18 mph.
Monday - 34°F
Dec 22, 2025
10 to 16 mph NW
Sunny
Sunny, with a high near 34. Northwest wind 10 to 16 mph.
Monday Night - 29°F
Dec 22, 2025
9 mph W
Mostly Cloudy then Slight Chance Light Snow
A slight chance of snow after 3am. Mostly cloudy, with a low around 29. West wind around 9 mph. Chance of precipitation is 20%.
Tuesday - 41°F
Dec 23, 2025
9 to 15 mph SW
Chance Light Snow then Rain And Snow
A chance of snow before 8am, then rain and snow. Cloudy, with a high near 41. Southwest wind 9 to 15 mph. Chance of precipitation is 80%. New snow accumulation of less than half an inch possible.
Tuesday Night - 35°F
Dec 23, 2025
14 mph W
Slight Chance Light Rain then Mostly Cloudy
A slight chance of rain before 9pm. Mostly cloudy, with a low around 35. West wind around 14 mph.
Wednesday - 40°F
Dec 24, 2025
9 to 14 mph NW
Sunny
Sunny, with a high near 40. Northwest wind 9 to 14 mph.
Wednesday Night - 30°F
Dec 24, 2025
8 mph W
Mostly Cloudy
Mostly cloudy, with a low around 30. West wind around 8 mph.
Christmas Day - 46°F
Dec 25, 2025
7 to 13 mph SW
Chance Light Rain
A chance of rain after 7am. Partly sunny, with a high near 46. Southwest wind 7 to 13 mph. Chance of precipitation is 40%.
Thursday Night - 40°F
Dec 25, 2025
13 mph SW
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 40. Southwest wind around 13 mph. Chance of precipitation is 40%.
Friday - 49°F
Dec 26, 2025
13 mph W
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 49. West wind around 13 mph. Chance of precipitation is 30%.
Friday Night - 35°F
Dec 26, 2025
12 mph W
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 35. West wind around 12 mph.

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