National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Nantucket, Nantucket Memorial Airport (KACK)

Lat: 41.25°NLon: 70.06°WElev: 46ft.

Fair

75°F

24°C

Humidity 90%
Wind Speed S 9 mph
Barometer 30.03 in (1017.0 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 2 Aug 12:53 pm EDT
Extended Forecast for

3 Miles NNW Siasconset MA

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 77. South wind around 10 mph.

    High: 77 °F

    Mostly Cloudy

  • Tonight

    Tonight: Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Patchy fog after 11pm. Low around 70. South wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    Heavy Rain
    and Patchy
    Fog

  • Monday

    Monday: Showers and thunderstorms before 3pm, then a chance of showers between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Some of the storms could produce heavy rainfall. Patchy fog between 4pm and 5pm. High near 78. Breezy, with a south wind around 21 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 78 °F

    Heavy Rain
    and Patchy
    Fog

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 3am, then showers likely and possibly a thunderstorm between 3am and 5am, then a slight chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 69. Southwest wind 10 to 18 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 69 °F

    Heavy Rain
    and Patchy
    Fog

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Northwest wind 8 to 10 mph becoming southwest in the afternoon.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph.

    Low: 69 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 78. South wind 5 to 9 mph.

    High: 78 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 69. Southwest wind around 9 mph.

    Low: 69 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 77. Southwest wind 10 to 15 mph.

    High: 77 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 77. South wind around 10 mph.
Tonight
Showers and possibly a thunderstorm before 4am, then a chance of showers and thunderstorms between 4am and 5am, then showers and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Patchy fog after 11pm. Low around 70. South wind 10 to 15 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday
Showers and thunderstorms before 3pm, then a chance of showers between 3pm and 5pm, then a chance of showers and thunderstorms after 5pm. Some of the storms could produce heavy rainfall. Patchy fog between 4pm and 5pm. High near 78. Breezy, with a south wind around 21 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Monday Night
Showers and thunderstorms likely before 3am, then showers likely and possibly a thunderstorm between 3am and 5am, then a slight chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Patchy fog. Otherwise, cloudy, then gradually becoming partly cloudy, with a low around 69. Southwest wind 10 to 18 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tuesday
Mostly sunny, with a high near 77. Northwest wind 8 to 10 mph becoming southwest in the afternoon.
Tuesday Night
Mostly cloudy, with a low around 69. Southwest wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 78. South wind 5 to 9 mph.
Wednesday Night
Mostly cloudy, with a low around 69. Southwest wind around 9 mph.
Thursday
Mostly sunny, with a high near 77. Southwest wind 10 to 15 mph.
Thursday Night
Partly cloudy, with a low around 70. Southwest wind 11 to 14 mph.
Friday
Mostly sunny, with a high near 77. Southwest wind 11 to 14 mph.
Friday Night
A chance of showers. Partly cloudy, with a low around 70. Southwest wind 11 to 13 mph. Chance of precipitation is 30%.
Saturday
A chance of showers. Mostly sunny, with a high near 77. Southwest wind 10 to 14 mph. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles NNW Siasconset MA
 41.31°N 70.02°W (Elev. 13 ft)
Last Update:
12:17 pm EDT Aug 2, 2026
Forecast Valid:
1pm EDT Aug 2, 2026-6pm EDT Aug 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation