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.

Heavy Rain Fog/Mist

68°F

20°C

Humidity 96%
Wind Speed NE 15 G 24 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 67°F (19°C)
Visibility 2.50 mi
Last update 21 Aug 7:53 am EDT
Extended Forecast for

2 Miles E Siasconset MA

  • Today

    Today: Showers and possibly a thunderstorm before 11am, then showers likely. Patchy fog before noon. High near 71. Breezy, with a northeast wind 18 to 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 71 °F

    Showers and
    Patchy Fog

  • Tonight

    Tonight: A chance of showers, mainly before 5am. Patchy fog. Otherwise, cloudy, with a low around 65. Northeast wind around 17 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 65 °F

    Chance
    Showers and
    Patchy Fog

  • Saturday

    Saturday: A chance of showers before 11am, then a slight chance of showers after 5pm. Patchy fog before 11am, then patchy fog after 4pm. Otherwise, mostly cloudy, with a high near 72. Northeast wind 8 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 30%.

    High: 72 °F

    Chance
    Showers and
    Patchy Fog
    then Patchy
    Fog

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Patchy fog before 8pm. Low around 67. Southeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 67 °F

    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers, mainly before 11am. High near 75. South wind 7 to 11 mph. Chance of precipitation is 80%.

    High: 75 °F

    Showers then
    Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers, with thunderstorms also possible after 2am. Mostly cloudy, with a low around 69. Southwest wind 7 to 9 mph. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 76. Southwest wind 7 to 11 mph.

    High: 76 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. West wind 9 to 11 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 75. Southwest wind 10 to 15 mph.

    High: 75 °F

    Sunny

Detailed Forecast

Today
Showers and possibly a thunderstorm before 11am, then showers likely. Patchy fog before noon. High near 71. Breezy, with a northeast wind 18 to 21 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
A chance of showers, mainly before 5am. Patchy fog. Otherwise, cloudy, with a low around 65. Northeast wind around 17 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A chance of showers before 11am, then a slight chance of showers after 5pm. Patchy fog before 11am, then patchy fog after 4pm. Otherwise, mostly cloudy, with a high near 72. Northeast wind 8 to 10 mph becoming southwest in the afternoon. Chance of precipitation is 30%.
Saturday Night
A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 8pm. Patchy fog before 8pm. Low around 67. Southeast wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers, mainly before 11am. High near 75. South wind 7 to 11 mph. Chance of precipitation is 80%.
Sunday Night
A chance of showers, with thunderstorms also possible after 2am. Mostly cloudy, with a low around 69. Southwest wind 7 to 9 mph. Chance of precipitation is 40%.
Monday
Mostly sunny, with a high near 76. Southwest wind 7 to 11 mph.
Monday Night
Mostly clear, with a low around 67. West wind 9 to 11 mph.
Tuesday
Sunny, with a high near 75. Southwest wind 10 to 15 mph.
Tuesday Night
Mostly clear, with a low around 68. West wind 9 to 13 mph.
Wednesday
Sunny, with a high near 76. Southwest wind 7 to 11 mph.
Wednesday Night
Partly cloudy, with a low around 69. Southwest wind 7 to 10 mph.
Thursday
A chance of showers. Partly sunny, with a high near 77. South wind 9 to 14 mph. Chance of precipitation is 30%.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles E Siasconset MA
 41.28°N 69.97°W (Elev. 56 ft)
Last Update:
3:49 am EDT Aug 21, 2026
Forecast Valid:
8am EDT Aug 21, 2026-6pm EDT Aug 27, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation