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Cohasset, MA Marine Weather Forecast

Station 44013 - BOSTON 16 NM East of Boston, MA

August 18, 2026 6:40 am EDT
Location: 42.346N 70.651W
Wind Direction: NNW (330°)
Wind Speed: 5.8 knots
Wind Gust: 7.8 knots
Atmospheric Pressure: 29.84 in (1010.5 mb)
Air Temperature: 66.9°F (19.4°C)
Dew Point: 66.7°F (19.3°C)
Water Temperature: 68.4°F (20.2°C)


Today - 76°F
Aug 18, 2026
8 mph NE
Patchy Fog then Mostly Cloudy
Patchy fog before 10am. Mostly cloudy, with a high near 76. Northeast wind around 8 mph.
Tonight - 64°F
Aug 18, 2026
6 mph SE
Patchy Fog
Patchy fog after 11pm. Mostly cloudy, with a low around 64. Southeast wind around 6 mph.
Wednesday - 84°F
Aug 19, 2026
3 to 7 mph SW
Patchy Fog then Partly Sunny
Patchy fog before 10am. Partly sunny, with a high near 84. Southwest wind 3 to 7 mph.
Wednesday Night - 67°F
Aug 19, 2026
5 to 8 mph SW
Partly Cloudy
Partly cloudy, with a low around 67. Southwest wind 5 to 8 mph.
Thursday - 81°F
Aug 20, 2026
6 mph N
Mostly Sunny then Chance Rain Showers
A chance of rain showers after 2pm. Mostly sunny, with a high near 81. North wind around 6 mph. Chance of precipitation is 40%.
Thursday Night - 63°F
Aug 20, 2026
3 mph SW
Slight Chance Showers And Thunderstorms
A chance of rain showers before 8pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 63. Southwest wind around 3 mph. Chance of precipitation is 40%.
Friday - 76°F
Aug 21, 2026
3 to 7 mph NE
Slight Chance Rain Showers
A slight chance of rain showers. Mostly sunny, with a high near 76. Northeast wind 3 to 7 mph.
Friday Night - 63°F
Aug 21, 2026
3 mph E
Slight Chance Rain Showers
A slight chance of rain showers. Mostly cloudy, with a low around 63. East wind around 3 mph.
Saturday - 76°F
Aug 22, 2026
3 to 8 mph NE
Chance Rain Showers
A chance of rain showers. Partly sunny, with a high near 76. Northeast wind 3 to 8 mph. Chance of precipitation is 40%.
Saturday Night - 64°F
Aug 22, 2026
2 to 6 mph E
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a low around 64. East wind 2 to 6 mph. Chance of precipitation is 60%.
Sunday - 78°F
Aug 23, 2026
5 to 8 mph NE
Rain Showers Likely
Rain showers likely before 2pm, then a chance of showers and thunderstorms. Mostly cloudy, with a high near 78. Northeast wind 5 to 8 mph. Chance of precipitation is 60%.
Sunday Night - 63°F
Aug 23, 2026
6 mph S
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 63. South wind around 6 mph. Chance of precipitation is 50%.
Monday - 79°F
Aug 24, 2026
8 mph SW
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
A slight chance of rain showers before 2pm, then a slight chance of showers and thunderstorms between 2pm and 4pm. Mostly sunny, with a high near 79. Southwest wind around 8 mph.
Monday Night - 61°F
Aug 24, 2026
7 mph SW
Partly Cloudy
Partly cloudy, with a low around 61. Southwest wind around 7 mph.

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