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

67°F

19°C

Humidity 91%
Wind Speed W 7 mph
Barometer 29.99 in (1015.4 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 25 Aug 10:53 pm EDT
Extended Forecast for

2 Miles NW Siasconset MA

  • Tonight

    Tonight: Clear, with a low around 64. West wind around 8 mph, with gusts as high as 20 mph.

    Low: 64 °F

    Clear

  • Wednesday

    Wednesday: Sunny, with a high near 77. Northwest wind around 8 mph becoming southwest in the afternoon.

    High: 77 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Increasing clouds, with a low around 63. South wind around 6 mph.

    Low: 63 °F

    Increasing
    Clouds

  • Thursday

    Thursday: Mostly sunny, with a high near 77. South wind 7 to 10 mph.

    High: 77 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers, mainly after 3am. Mostly cloudy, with a low around 68. South wind around 8 mph. Chance of precipitation is 30%.

    Low: 68 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms. Partly sunny, with a high near 76. South wind around 9 mph. Chance of precipitation is 40%.

    High: 76 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 65. Southwest wind around 6 mph.

    Low: 65 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 74. North wind 6 to 9 mph.

    High: 74 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 58. East wind around 5 mph becoming calm in the evening.

    Low: 58 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Clear, with a low around 64. West wind around 8 mph, with gusts as high as 20 mph.
Wednesday
Sunny, with a high near 77. Northwest wind around 8 mph becoming southwest in the afternoon.
Wednesday Night
Increasing clouds, with a low around 63. South wind around 6 mph.
Thursday
Mostly sunny, with a high near 77. South wind 7 to 10 mph.
Thursday Night
A chance of showers, mainly after 3am. Mostly cloudy, with a low around 68. South wind around 8 mph. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 76. South wind around 9 mph. Chance of precipitation is 40%.
Friday Night
Mostly cloudy, with a low around 65. Southwest wind around 6 mph.
Saturday
Mostly cloudy, with a high near 74. North wind 6 to 9 mph.
Saturday Night
Mostly cloudy, with a low around 58. East wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny, with a high near 75. Light and variable wind becoming east 5 to 8 mph in the morning.
Sunday Night
Partly cloudy, with a low around 63. Southwest wind around 6 mph.
Monday
Mostly sunny, with a high near 78. Southwest wind 8 to 13 mph.
Monday Night
Partly cloudy, with a low around 66. Southwest wind around 10 mph.
Tuesday
Partly sunny, with a high near 77. Southwest wind 9 to 11 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NW Siasconset MA
 41.29°N 70.02°W (Elev. 33 ft)
Last Update:
6:34 pm EDT Aug 25, 2026
Forecast Valid:
11pm EDT Aug 25, 2026-6pm EDT Sep 1, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation