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

73°F

23°C

Humidity 96%
Wind Speed SW 10 mph
Barometer 29.89 in (1012.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Last update 19 Aug 6:53 pm EDT
Extended Forecast for

2 Miles ENE Siasconset MA

  • Tonight

    Tonight: Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 70. Southwest wind 6 to 9 mph.

    Low: 70 °F

    Partly Cloudy
    then Patchy
    Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 78. Southwest wind 5 to 8 mph.

    High: 78 °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 chance of showers. Partly sunny, with a high near 74. North wind 7 to 10 mph becoming east in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 74 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers. Mostly cloudy, with a low around 67. East wind around 8 mph. Chance of precipitation is 50%.

    Low: 67 °F

    Chance
    Showers

  • Saturday

    Saturday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 76. Southeast wind 10 to 13 mph. Chance of precipitation is 60%.

    High: 76 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers likely. Mostly cloudy, with a low around 69. South wind around 8 mph. Chance of precipitation is 70%.

    Low: 69 °F

    Showers
    Likely

  • Sunday

    Sunday: Showers likely, mainly before 9am. Mostly cloudy, with a high near 78. South wind around 10 mph. Chance of precipitation is 60%.

    High: 78 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A chance of showers between 8pm and 4am. Mostly cloudy, with a low around 69. South wind 8 to 10 mph. Chance of precipitation is 30%.

    Low: 69 °F

    Chance
    Showers

Detailed Forecast

Tonight
Patchy fog between 1am and 2am. Otherwise, partly cloudy, with a low around 70. Southwest wind 6 to 9 mph.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 78. 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 chance of showers. Partly sunny, with a high near 74. North wind 7 to 10 mph becoming east in the afternoon. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of showers. Mostly cloudy, with a low around 67. East wind around 8 mph. Chance of precipitation is 50%.
Saturday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 76. Southeast wind 10 to 13 mph. Chance of precipitation is 60%.
Saturday Night
Showers likely. Mostly cloudy, with a low around 69. South wind around 8 mph. Chance of precipitation is 70%.
Sunday
Showers likely, mainly before 9am. Mostly cloudy, with a high near 78. South wind around 10 mph. Chance of precipitation is 60%.
Sunday Night
A chance of showers between 8pm and 4am. Mostly cloudy, with a low around 69. South wind 8 to 10 mph. Chance of precipitation is 30%.
Monday
Mostly sunny, with a high near 77. West wind 8 to 11 mph.
Monday Night
Mostly clear, with a low around 67. Southwest wind 9 to 11 mph.
Tuesday
Sunny, with a high near 76. Northwest wind 8 to 10 mph becoming southwest in the afternoon.
Tuesday Night
Mostly clear, with a low around 68. Southwest wind 8 to 10 mph.
Wednesday
Mostly sunny, with a high near 76. South wind 7 to 10 mph.
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles ENE Siasconset MA
 41.28°N 69.97°W (Elev. 56 ft)
Last Update:
3:43 pm EDT Aug 19, 2026
Forecast Valid:
7pm EDT Aug 19, 2026-6pm EDT Aug 26, 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