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.

Overcast

67°F

19°C

Humidity 100%
Wind Speed E 9 mph
Barometer 29.87 in (1011.4 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 23 Aug 7:53 am EDT
Extended Forecast for

2 Miles ENE Siasconset MA

  • Today

    Today: Showers likely, mainly before 9am. Patchy fog before noon. Otherwise, partly sunny, with a high near 76. Southeast wind 9 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 76 °F

    Showers
    Likely and
    Patchy Fog
    then Partly
    Sunny

  • Tonight

    Tonight: Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 68. South wind 9 to 11 mph.

    Low: 68 °F

    Patchy Fog

  • Monday

    Monday: Partly sunny, then gradually becoming sunny, with a high near 76. Southwest wind 7 to 11 mph.

    High: 76 °F

    Becoming
    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 67. Southwest wind around 8 mph.

    Low: 67 °F

    Mostly Clear

  • Tuesday

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

    High: 75 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. West wind 9 to 13 mph.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 74. Southwest wind 7 to 11 mph.

    High: 74 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 68. Southwest wind 6 to 9 mph.

    Low: 68 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 76. South wind 5 to 10 mph.

    High: 76 °F

    Mostly Sunny

Detailed Forecast

Today
Showers likely, mainly before 9am. Patchy fog before noon. Otherwise, partly sunny, with a high near 76. Southeast wind 9 to 11 mph becoming southwest in the afternoon. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Tonight
Patchy fog before 2am. Otherwise, mostly cloudy, with a low around 68. South wind 9 to 11 mph.
Monday
Partly sunny, then gradually becoming sunny, with a high near 76. Southwest wind 7 to 11 mph.
Monday Night
Mostly clear, with a low around 67. Southwest wind around 8 mph.
Tuesday
Sunny, with a high near 75. Southwest wind 10 to 15 mph.
Tuesday Night
Mostly clear, with a low around 66. West wind 9 to 13 mph.
Wednesday
Sunny, with a high near 74. Southwest wind 7 to 11 mph.
Wednesday Night
Mostly clear, with a low around 68. Southwest wind 6 to 9 mph.
Thursday
Mostly sunny, with a high near 76. South wind 5 to 10 mph.
Thursday Night
A chance of showers after midnight. Mostly cloudy, with a low around 68. South wind around 9 mph. Chance of precipitation is 40%.
Friday
A chance of showers. Mostly cloudy, with a high near 77. South wind around 11 mph. Chance of precipitation is 40%.
Friday Night
Mostly cloudy, with a low around 69. Southwest wind 8 to 10 mph.
Saturday
Mostly sunny, with a high near 77. West wind 8 to 10 mph.
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Forecast Area
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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:
2:30 am EDT Aug 23, 2026
Forecast Valid:
8am EDT Aug 23, 2026-6pm EDT Aug 29, 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

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation