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South Dennis, MA Marine Weather Forecast

Station 44090 - Cape Cod Bay, MA (221)

December 20, 2025 6:30 am EST
Location: 41.84N 70.329W
Significant Wave Height: 3.3 ft
Dominant Wave Period: 5 sec
Average Period: 3.5 sec
Mean Wave Direction: NNW (335°)
Air Temperature: 33.8°F (1.0°C)
Water Temperature: 44.1°F (6.7°C)


Today - 42°F
Dec 20, 2025
7 to 15 mph W
Mostly Sunny
Mostly sunny, with a high near 42. West wind 7 to 15 mph, with gusts as high as 30 mph.
Tonight - 33°F
Dec 20, 2025
7 to 18 mph SW
Mostly Cloudy
Mostly cloudy. Low around 33, with temperatures rising to around 41 overnight. Southwest wind 7 to 18 mph, with gusts as high as 30 mph.
Sunday - 45°F
Dec 21, 2025
14 to 20 mph W
Partly Sunny
Partly sunny. High near 45, with temperatures falling to around 38 in the afternoon. West wind 14 to 20 mph.
Sunday Night - 25°F
Dec 21, 2025
21 mph NW
Partly Cloudy
Partly cloudy, with a low around 25. Northwest wind around 21 mph.
Monday - 34°F
Dec 22, 2025
12 to 18 mph NW
Sunny
Sunny, with a high near 34. Northwest wind 12 to 18 mph.
Monday Night - 28°F
Dec 22, 2025
8 to 12 mph W
Mostly Cloudy
Mostly cloudy, with a low around 28. West wind 8 to 12 mph.
Tuesday - 41°F
Dec 23, 2025
8 to 15 mph SW
Chance Light Snow then Rain And Snow
A chance of snow between 7am and 9am, then rain and snow. Cloudy, with a high near 41. Southwest wind 8 to 15 mph. Chance of precipitation is 80%. New snow accumulation of less than half an inch possible.
Tuesday Night - 32°F
Dec 23, 2025
13 to 16 mph W
Chance Light Rain then Mostly Cloudy
A chance of rain before midnight. Mostly cloudy, with a low around 32. West wind 13 to 16 mph. Chance of precipitation is 30%.
Wednesday - 40°F
Dec 24, 2025
12 to 16 mph NW
Mostly Sunny
Mostly sunny, with a high near 40. Northwest wind 12 to 16 mph.
Wednesday Night - 30°F
Dec 24, 2025
6 to 10 mph W
Mostly Cloudy
Mostly cloudy, with a low around 30. West wind 6 to 10 mph.
Christmas Day - 46°F
Dec 25, 2025
7 to 13 mph SW
Chance Light Rain
A chance of rain after 7am. Mostly cloudy, with a high near 46. Southwest wind 7 to 13 mph. Chance of precipitation is 40%.
Thursday Night - 38°F
Dec 25, 2025
12 mph SW
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 38. Southwest wind around 12 mph. Chance of precipitation is 40%.
Friday - 47°F
Dec 26, 2025
14 mph W
Chance Light Rain
A chance of rain. Mostly cloudy, with a high near 47. West wind around 14 mph. Chance of precipitation is 30%.
Friday Night - 32°F
Dec 26, 2025
12 mph W
Chance Light Rain
A chance of rain. Mostly cloudy, with a low around 32. West wind around 12 mph.

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