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

65°F

18°C

Humidity 84%
Wind Speed W 12 mph
Barometer 29.58 in (1001.8 mb)
Dewpoint 60°F (16°C)
Visibility 10.00 mi
Last update 19 Jun 4:53 am EDT
Extended Forecast for

Siasconset MA

  • Juneteenth

    Juneteenth: Sunny through mid morning, then becoming mostly cloudy, with a high near 79. Southwest wind 14 to 18 mph.

    High: 79 °F

    Mostly Cloudy

  • Tonight

    Tonight: Mostly clear, with a low around 65. Southwest wind 10 to 15 mph.

    Low: 65 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 80. Breezy, with a west wind 18 to 20 mph.

    High: 80 °F

    Sunny then
    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 64. West wind 9 to 11 mph.

    Low: 64 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 79. Southwest wind 7 to 9 mph.

    High: 79 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65. Southwest wind around 7 mph.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Showers likely, mainly after 4pm. Partly sunny, with a high near 81. South wind 6 to 14 mph. Chance of precipitation is 60%.

    High: 81 °F

    Chance
    Showers then
    Showers
    Likely

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Low around 65. Breezy, with a southwest wind 21 to 23 mph. Chance of precipitation is 80%.

    Low: 65 °F

    Showers and
    Breezy

  • Tuesday

    Tuesday: Showers likely, mainly before 9am. Partly sunny, with a high near 80. Breezy, with a west wind 14 to 20 mph. Chance of precipitation is 60%.

    High: 80 °F

    Showers
    Likely and
    Breezy

Detailed Forecast

Juneteenth
Sunny through mid morning, then becoming mostly cloudy, with a high near 79. Southwest wind 14 to 18 mph.
Tonight
Mostly clear, with a low around 65. Southwest wind 10 to 15 mph.
Saturday
Sunny, with a high near 80. Breezy, with a west wind 18 to 20 mph.
Saturday Night
Mostly clear, with a low around 64. West wind 9 to 11 mph.
Sunday
Sunny, with a high near 79. Southwest wind 7 to 9 mph.
Sunday Night
Partly cloudy, with a low around 65. Southwest wind around 7 mph.
Monday
Showers likely, mainly after 4pm. Partly sunny, with a high near 81. South wind 6 to 14 mph. Chance of precipitation is 60%.
Monday Night
Showers and possibly a thunderstorm. Low around 65. Breezy, with a southwest wind 21 to 23 mph. Chance of precipitation is 80%.
Tuesday
Showers likely, mainly before 9am. Partly sunny, with a high near 80. Breezy, with a west wind 14 to 20 mph. Chance of precipitation is 60%.
Tuesday Night
Partly cloudy, with a low around 65. West wind around 9 mph.
Wednesday
Sunny, with a high near 79. West wind around 8 mph becoming southwest in the afternoon.
Wednesday Night
Partly cloudy, with a low around 65. South wind around 7 mph.
Thursday
Mostly sunny, with a high near 79. South wind 6 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Siasconset MA
 41.28°N 69.97°W (Elev. 56 ft)
Last Update:
4:18 am EDT Jun 19, 2026
Forecast Valid:
5am EDT Jun 19, 2026-6pm EDT Jun 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