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.

Partly Cloudy

75°F

24°C

Humidity 88%
Wind Speed S 12 mph
Barometer 29.90 in (1012.4 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 19 Aug 11:53 am EDT
Extended Forecast for

Siasconset MA

  • This Afternoon

    This Afternoon: Mostly sunny, with a high near 77. Southwest wind around 11 mph.

    High: 77 °F

    Mostly Sunny

  • Tonight

    Tonight: Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 70. Southwest wind 6 to 8 mph.

    Low: 70 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 79. Southwest wind 5 to 8 mph.

    High: 79 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Showers and thunderstorms before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before 2am. Low around 68. Southwest wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%.

    Low: 68 °F

    Heavy Rain
    and Patchy
    Fog

  • Friday

    Friday: A slight chance of showers and thunderstorms before 10am, then a slight chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 75. Northeast wind 7 to 10 mph. Chance of precipitation is 20%.

    High: 75 °F

    Slight Chance
    T-storms and
    Patchy Fog

  • Friday Night

    Friday Night: A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 66. Northeast wind around 8 mph. Chance of precipitation is 30%.

    Low: 66 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, mainly after 3pm. Partly sunny, with a high near 75. East wind 11 to 13 mph. Chance of precipitation is 60%.

    High: 75 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely, mainly before 3am. Mostly cloudy, with a low around 68. East wind 6 to 10 mph. Chance of precipitation is 60%.

    Low: 68 °F

    Showers
    Likely

  • Sunday

    Sunday: A chance of showers. Mostly cloudy, with a high near 77. Southeast wind 7 to 10 mph becoming south in the afternoon. Chance of precipitation is 50%.

    High: 77 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Mostly sunny, with a high near 77. Southwest wind around 11 mph.
Tonight
Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 70. Southwest wind 6 to 8 mph.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 79. Southwest wind 5 to 8 mph.
Thursday Night
Showers and thunderstorms before 2am, then a chance of showers. Some of the storms could produce heavy rainfall. Patchy fog before 2am. Low around 68. Southwest wind around 6 mph becoming northwest after midnight. Chance of precipitation is 80%.
Friday
A slight chance of showers and thunderstorms before 10am, then a slight chance of showers after 2pm. Patchy fog before 7am. Otherwise, partly sunny, with a high near 75. Northeast wind 7 to 10 mph. Chance of precipitation is 20%.
Friday Night
A chance of showers, mainly after 8pm. Mostly cloudy, with a low around 66. Northeast wind around 8 mph. Chance of precipitation is 30%.
Saturday
Showers likely, mainly after 3pm. Partly sunny, with a high near 75. East wind 11 to 13 mph. Chance of precipitation is 60%.
Saturday Night
Showers likely, mainly before 3am. Mostly cloudy, with a low around 68. East wind 6 to 10 mph. Chance of precipitation is 60%.
Sunday
A chance of showers. Mostly cloudy, with a high near 77. Southeast wind 7 to 10 mph becoming south in the afternoon. Chance of precipitation is 50%.
Sunday Night
A chance of showers before 5am. Mostly cloudy, with a low around 69. Southwest wind around 9 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 78. Southwest wind 9 to 11 mph.
Monday Night
Partly cloudy, with a low around 68. West wind 8 to 11 mph.
Tuesday
Sunny, with a high near 76. Southwest wind 8 to 11 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Siasconset MA
 41.28°N 69.97°W (Elev. 56 ft)
Last Update:
12:51 pm EDT Aug 19, 2026
Forecast Valid:
2pm EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation