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Shelter Island, NY Marine Weather Forecast

Overnight - 68°F
Aug 18, 2026
5 mph N
Patchy Fog
Patchy fog after 2am. Mostly cloudy, with a low around 68. North wind around 5 mph.
Tuesday - 78°F
Aug 18, 2026
6 mph NW
Patchy Fog then Mostly Sunny
Patchy fog before 8am. Mostly sunny, with a high near 78. Northwest wind around 6 mph.
Tuesday Night - 67°F
Aug 18, 2026
6 mph W
Mostly Clear
Mostly clear, with a low around 67. West wind around 6 mph.
Wednesday - 78°F
Aug 19, 2026
2 to 8 mph W
Sunny
Sunny, with a high near 78. West wind 2 to 8 mph.
Wednesday Night - 69°F
Aug 19, 2026
8 mph SW
Mostly Clear
Mostly clear, with a low around 69. Southwest wind around 8 mph.
Thursday - 77°F
Aug 20, 2026
6 mph W
Chance Showers And Thunderstorms
A slight chance of rain showers between 8am and 2pm, then a chance of showers and thunderstorms. Mostly sunny, with a high near 77. Chance of precipitation is 40%. New rainfall amounts between a tenth and quarter of an inch possible.
Thursday Night - 67°F
Aug 20, 2026
1 to 6 mph NW
Chance Showers And Thunderstorms
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 50%.
Friday - 78°F
Aug 21, 2026
7 mph NE
Chance Rain Showers
A chance of rain showers. Partly sunny, with a high near 78. Chance of precipitation is 50%.
Friday Night - 67°F
Aug 21, 2026
5 mph NE
Chance Rain Showers
A chance of rain showers. Mostly cloudy, with a low around 67. Chance of precipitation is 40%.
Saturday - 77°F
Aug 22, 2026
5 to 9 mph E
Chance Rain Showers
A chance of rain showers. Partly sunny, with a high near 77. Chance of precipitation is 40%.
Saturday Night - 68°F
Aug 22, 2026
7 mph E
Rain Showers Likely
Rain showers likely. Mostly cloudy, with a low around 68. Chance of precipitation is 60%.
Sunday - 79°F
Aug 23, 2026
6 to 9 mph SE
Rain Showers Likely
Rain showers likely. Partly sunny, with a high near 79. Chance of precipitation is 60%.
Sunday Night - 68°F
Aug 23, 2026
7 mph SW
Chance Rain Showers
A chance of rain showers before 2am. Partly cloudy, with a low around 68. Chance of precipitation is 50%.
Monday - 79°F
Aug 24, 2026
6 to 10 mph W
Mostly Sunny then Slight Chance Rain Showers
A slight chance of rain showers after 2pm. Mostly sunny, with a high near 79.

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