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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

38°F

3°C

Humidity 48%
Wind Speed NW 20 G 36 mph
Barometer 29.73 in (1006.8 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill28°F (-2°C)
Last update 11 Feb 4:56 pm EST
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind 11 to 13 mph.

    Low: 25 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 11 to 14 mph.

    High: 37 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind around 8 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 36. Wind chill values between 10 and 20. Northwest wind 7 to 9 mph.

    High: 36 °F

    Sunny

  • Friday Night

    Friday Night: A 20 percent chance of snow showers or flurries after 1am. Increasing clouds, with a low around 26. West wind around 7 mph.

    Low: 26 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 40.

    High: 40 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 26.

    Low: 26 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 38.

    High: 38 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 29. Chance of precipitation is 40%.

    Low: 29 °F

    Chance
    Rain/Snow

Detailed Forecast

Tonight
Partly cloudy, with a low around 25. Wind chill values between 15 and 20. West wind 11 to 13 mph.
Thursday
Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 11 to 14 mph.
Thursday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind around 8 mph.
Friday
Sunny, with a high near 36. Wind chill values between 10 and 20. Northwest wind 7 to 9 mph.
Friday Night
A 20 percent chance of snow showers or flurries after 1am. Increasing clouds, with a low around 26. West wind around 7 mph.
Saturday
Mostly sunny, with a high near 40.
Saturday Night
Partly cloudy, with a low around 26.
Sunday
Partly sunny, with a high near 38.
Sunday Night
A chance of rain and snow before 1am, then a chance of snow. Mostly cloudy, with a low around 29. Chance of precipitation is 40%.
Washington's Birthday
A chance of rain and snow. Mostly cloudy, with a high near 40. Chance of precipitation is 40%.
Monday Night
Partly cloudy, with a low around 30.
Tuesday
Mostly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 31.
Wednesday
A 40 percent chance of rain. Mostly cloudy, with a high near 42.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
12:37 pm EST Feb 11, 2026
Forecast Valid:
5pm EST Feb 11, 2026-6pm EST Feb 18, 2026
 
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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