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.

Fog/Mist

76°F

24°C

Humidity 88%
Wind Speed SW 10 mph
Barometer 30.08 in (1018.6 mb)
Dewpoint 72°F (22°C)
Visibility 1.50 mi
Heat Index76°F (24°C)
Last update 15 Jul 1:53 pm EDT
Extended Forecast for

Siasconset MA

  • This Afternoon

    This Afternoon: Partly sunny, with a high near 79. Southwest wind around 9 mph.

    High: 79 °F

    Partly Sunny

  • Tonight

    Tonight: Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southwest wind 6 to 8 mph.

    Low: 69 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, partly sunny, with a high near 80. Southwest wind 6 to 10 mph.

    High: 80 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A slight chance of showers between 3am and 5am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 69. Southwest wind around 9 mph. Chance of precipitation is 20%.

    Low: 69 °F

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Thursday

    Thursday: A slight chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 3pm. Partly sunny, with a high near 81. Southwest wind 10 to 14 mph. Chance of precipitation is 20%.

    High: 81 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday Night

    Thursday Night: A slight chance of showers between 11pm and 1am. Partly cloudy, with a low around 70. Southwest wind around 11 mph. Chance of precipitation is 20%.

    Low: 70 °F

    Slight Chance
    Showers

  • Friday

    Friday: Sunny, with a high near 82. West wind around 11 mph.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 66. North wind around 6 mph.

    Low: 66 °F

    Mostly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 77. Northeast wind 7 to 9 mph.

    High: 77 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a high near 79. Southwest wind around 9 mph.
Tonight
Patchy fog. Otherwise, mostly cloudy, with a low around 69. Southwest wind 6 to 8 mph.
Wednesday
Patchy fog before 9am. Otherwise, partly sunny, with a high near 80. Southwest wind 6 to 10 mph.
Wednesday Night
A slight chance of showers between 3am and 5am, then a slight chance of showers and thunderstorms after 5am. Mostly cloudy, with a low around 69. Southwest wind around 9 mph. Chance of precipitation is 20%.
Thursday
A slight chance of showers and thunderstorms before 11am, then a slight chance of showers between 11am and 3pm. Partly sunny, with a high near 81. Southwest wind 10 to 14 mph. Chance of precipitation is 20%.
Thursday Night
A slight chance of showers between 11pm and 1am. Partly cloudy, with a low around 70. Southwest wind around 11 mph. Chance of precipitation is 20%.
Friday
Sunny, with a high near 82. West wind around 11 mph.
Friday Night
Mostly cloudy, with a low around 66. North wind around 6 mph.
Saturday
Sunny, with a high near 77. Northeast wind 7 to 9 mph.
Saturday Night
Partly cloudy, with a low around 66. East wind around 5 mph becoming light and variable in the evening.
Sunday
Partly sunny, with a high near 79. South wind 6 to 9 mph.
Sunday Night
A chance of showers. Mostly cloudy, with a low around 67. South wind around 8 mph. Chance of precipitation is 40%.
Monday
A chance of showers. Mostly sunny, with a high near 79. West wind around 10 mph becoming south in the afternoon. Chance of precipitation is 30%.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Siasconset MA
 41.28°N 70°W (Elev. 49 ft)
Last Update:
7:45 am EDT Jul 15, 2025
Forecast Valid:
2pm EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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