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.

Mostly Cloudy

64°F

18°C

Humidity 78%
Wind Speed NE 13 mph
Barometer 29.94 in (1013.9 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 26 Jul 12:53 am EDT
Extended Forecast for

Siasconset MA

  • Overnight

    Overnight: Mostly cloudy, with a low around 60. Northeast wind around 7 mph.

    Low: 60 °F

    Mostly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 73. Northeast wind 10 to 13 mph.

    High: 73 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 59. North wind 7 to 10 mph.

    Low: 59 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, then gradually becoming sunny, with a high near 74. North wind 7 to 10 mph.

    High: 74 °F

    Decreasing
    Clouds

  • Monday Night

    Monday Night: Mostly clear, with a low around 63. Light south wind.

    Low: 63 °F

    Mostly Clear

  • Tuesday

    Tuesday: A slight chance of showers after 3pm. Mostly sunny, with a high near 76. South wind 6 to 11 mph. Chance of precipitation is 20%.

    High: 76 °F

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Showers likely, mainly after 2am. Mostly cloudy, with a low around 65. Southeast wind 9 to 13 mph. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Wednesday

    Wednesday: Showers likely. Mostly cloudy, with a high near 76. Southeast wind 14 to 16 mph. Chance of precipitation is 70%.

    High: 76 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: A chance of showers. Mostly cloudy, with a low around 65. East wind around 11 mph. Chance of precipitation is 50%.

    Low: 65 °F

    Chance
    Showers

Detailed Forecast

Overnight
Mostly cloudy, with a low around 60. Northeast wind around 7 mph.
Sunday
Partly sunny, with a high near 73. Northeast wind 10 to 13 mph.
Sunday Night
Mostly cloudy, with a low around 59. North wind 7 to 10 mph.
Monday
Mostly cloudy, then gradually becoming sunny, with a high near 74. North wind 7 to 10 mph.
Monday Night
Mostly clear, with a low around 63. Light south wind.
Tuesday
A slight chance of showers after 3pm. Mostly sunny, with a high near 76. South wind 6 to 11 mph. Chance of precipitation is 20%.
Tuesday Night
Showers likely, mainly after 2am. Mostly cloudy, with a low around 65. Southeast wind 9 to 13 mph. Chance of precipitation is 60%.
Wednesday
Showers likely. Mostly cloudy, with a high near 76. Southeast wind 14 to 16 mph. Chance of precipitation is 70%.
Wednesday Night
A chance of showers. Mostly cloudy, with a low around 65. East wind around 11 mph. Chance of precipitation is 50%.
Thursday
A chance of showers before 10am. Partly sunny, with a high near 76. North wind 10 to 13 mph. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 66. West wind 6 to 9 mph.
Friday
Mostly sunny, with a high near 77. West wind 7 to 10 mph.
Friday Night
Partly cloudy, with a low around 66. Southwest wind around 7 mph.
Saturday
Mostly sunny, with a high near 78. Southwest wind 6 to 9 mph.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Siasconset MA
 41.28°N 70°W (Elev. 49 ft)
Last Update:
12:45 am EDT Jul 26, 2026
Forecast Valid:
1am EDT Jul 26, 2026-6pm EDT Aug 1, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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