National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Nantucket, Nantucket Memorial Airport (KACK)

Lat: 41.25°NLon: 70.06°WElev: 46ft.

A Few Clouds

64°F

18°C

Humidity 75%
Wind Speed E 8 mph
Barometer 30.15 in (1020.9 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 20 Aug 7:53 am EDT
Extended Forecast for

2 Miles NNW Siasconset MA

High Surf Advisory August 20, 08:51am until August 23, 08:00am
Click here for hazard details and duration
High Surf Advisory
  •  
    High Surf Advisory August 20, 08:51am until August 23, 08:00am

    NOW until 8:00am Sat

    High Surf Advisory

  • Today

    High: 70 °F

    Mostly Sunny
    then Chance
    Showers

  • Tonight

    Tonight: Showers likely. Patchy fog. Otherwise, cloudy, with a low around 60. East wind around 14 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 60 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A chance of showers. Mostly cloudy, with a high near 71. East wind 16 to 18 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 71 °F

    Chance
    Showers

  • Thursday Night

    Thursday Night: A chance of showers, mainly before 10pm. Mostly cloudy, with a low around 63. Breezy, with a northeast wind 20 to 24 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 63 °F

    Chance
    Showers and
    Breezy

  • Friday

    Friday: A slight chance of showers before noon. Mostly sunny, with a high near 74. Windy, with a northeast wind 23 to 26 mph, with gusts as high as 39 mph. Chance of precipitation is 20%.

    High: 74 °F

    Slight Chance
    Showers and
    Windy then
    Mostly Sunny
    and Breezy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. North wind 14 to 17 mph.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 74. North wind 11 to 14 mph.

    High: 74 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. Southwest wind around 7 mph.

    Low: 63 °F

    Mostly Clear

Detailed Forecast

Today
A chance of showers, mainly after 3pm. Partly sunny, with a high near 70. East wind 9 to 14 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers likely. Patchy fog. Otherwise, cloudy, with a low around 60. East wind around 14 mph. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Thursday
A chance of showers. Mostly cloudy, with a high near 71. East wind 16 to 18 mph. Chance of precipitation is 40%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A chance of showers, mainly before 10pm. Mostly cloudy, with a low around 63. Breezy, with a northeast wind 20 to 24 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday
A slight chance of showers before noon. Mostly sunny, with a high near 74. Windy, with a northeast wind 23 to 26 mph, with gusts as high as 39 mph. Chance of precipitation is 20%.
Friday Night
Partly cloudy, with a low around 62. North wind 14 to 17 mph.
Saturday
Sunny, with a high near 74. North wind 11 to 14 mph.
Saturday Night
Mostly clear, with a low around 63. Southwest wind around 7 mph.
Sunday
Sunny, with a high near 75. South wind 8 to 10 mph.
Sunday Night
A chance of showers after 3am. Mostly cloudy, with a low around 64. South wind around 9 mph. Chance of precipitation is 30%.
Monday
A chance of showers. Partly sunny, with a high near 75. South wind around 11 mph. Chance of precipitation is 50%.
Monday Night
A chance of showers. Mostly cloudy, with a low around 63. Southwest wind around 8 mph. Chance of precipitation is 40%.
Tuesday
Mostly sunny, with a high near 75. West wind around 10 mph.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
2 Miles NNW Siasconset MA
 41.29°N 70.02°W (Elev. 33 ft)
Last Update:
2:27 am EDT Aug 20, 2025
Forecast Valid:
8am EDT Aug 20, 2025-6pm EDT Aug 26, 2025
 
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