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

25°F

-4°C

Humidity 69%
Wind Speed W 5 mph
Barometer 30.12 in (1020.0 mb)
Dewpoint 16°F (-9°C)
Visibility 10.00 mi
Wind Chill19°F (-7°C)
Last update 14 Feb 12:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 20 percent chance of snow showers after 4am. Mostly cloudy, with a low around 24. West wind around 6 mph.

    Low: 24 °F

    Slight Chance
    Snow Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 40. Wind chill values between 20 and 30. West wind 8 to 14 mph.

    High: 40 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 24. West wind around 6 mph becoming calm in the evening.

    Low: 24 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 36. Wind chill values between 25 and 30. Calm wind becoming east around 6 mph in the morning.

    High: 36 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 30 percent chance of snow. Mostly cloudy, with a low around 26. Light southeast wind.

    Low: 26 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 45.

    High: 45 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of snow showers after 4am. Mostly cloudy, with a low around 24. West wind around 6 mph.
Saturday
Mostly sunny, with a high near 40. Wind chill values between 20 and 30. West wind 8 to 14 mph.
Saturday Night
Mostly clear, with a low around 24. West wind around 6 mph becoming calm in the evening.
Sunday
Partly sunny, with a high near 36. Wind chill values between 25 and 30. Calm wind becoming east around 6 mph in the morning.
Sunday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 26. Light southeast wind.
Washington's Birthday
Partly sunny, with a high near 42.
Monday Night
Mostly cloudy, with a low around 32.
Tuesday
Partly sunny, with a high near 45.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A chance of rain and snow after 1pm. Cloudy, with a high near 42. Chance of precipitation is 40%.
Wednesday Night
Rain and snow likely. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Thursday
A chance of rain and snow. Mostly cloudy, with a high near 42. Chance of precipitation is 30%.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 28.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 50%.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
1:16 pm EST Feb 13, 2026
Forecast Valid:
1am EST Feb 14, 2026-6pm EST Feb 20, 2026
 
Forecast Discussion
 
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Additional Resources

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