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.

Fair

34°F

1°C

Humidity 82%
Wind Speed S 5 mph
Barometer 29.74 in (1007.0 mb)
Dewpoint 29°F (-2°C)
Visibility 9.00 mi
Wind Chill29°F (-2°C)
Last update 26 Feb 1:56 am EST
Extended Forecast for

Islip Terrace NY

  • Overnight

    Overnight: Partly cloudy, with a low around 30. West wind around 6 mph.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: A 20 percent chance of snow after 1pm. Partly sunny, with a high near 37. Northwest wind around 5 mph becoming calm in the afternoon.

    High: 37 °F

    Mostly Sunny
    then Slight
    Chance Snow

  • Thursday Night

    Thursday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 22. Calm wind.

    Low: 22 °F

    Decreasing
    Clouds

  • Friday

    Friday: Sunny, with a high near 39. Wind chill values between 20 and 30. Calm wind becoming south around 5 mph.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 30. Calm wind.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 29.

    Low: 29 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 18.

    Low: 18 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 30. West wind around 6 mph.
Thursday
A 20 percent chance of snow after 1pm. Partly sunny, with a high near 37. Northwest wind around 5 mph becoming calm in the afternoon.
Thursday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 22. Calm wind.
Friday
Sunny, with a high near 39. Wind chill values between 20 and 30. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 30. Calm wind.
Saturday
Sunny, with a high near 45.
Saturday Night
Increasing clouds, with a low around 29.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
Partly cloudy, with a low around 18.
Monday
A 30 percent chance of snow. Mostly cloudy, with a high near 28.
Monday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 19.
Tuesday
A chance of rain and snow. Mostly cloudy, with a high near 37. Chance of precipitation is 30%.
Tuesday Night
A 50 percent chance of rain. Cloudy, with a low around 28.
Wednesday
A 50 percent chance of rain. Partly sunny, with a high near 42.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
12:57 am EST Feb 26, 2026
Forecast Valid:
2am EST Feb 26, 2026-6pm EST Mar 4, 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