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

16°F

-9°C

Humidity 56%
Wind Speed N 18 G 36 mph
Barometer 29.84 in (1010.7 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Wind Chill0°F (-18°C)
Last update 2 Feb 12:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: Partly cloudy, with a low around 12. Wind chill values between zero and 5. Northwest wind around 8 mph.

    Low: 12 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 29. Wind chill values between zero and 10. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 29 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 13. Light northwest wind.

    Low: 13 °F

    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 32. Wind chill values between 15 and 25. Calm wind becoming west 5 to 7 mph in the morning.

    High: 32 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 22. Calm wind.

    Low: 22 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 32.

    High: 32 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 14.

    Low: 14 °F

    Partly Cloudy

  • Thursday

    Thursday: Mostly sunny, with a high near 28.

    High: 28 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 13.

    Low: 13 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 12. Wind chill values between zero and 5. Northwest wind around 8 mph.
Monday
Sunny, with a high near 29. Wind chill values between zero and 10. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Monday Night
Mostly clear, with a low around 13. Light northwest wind.
Tuesday
Mostly sunny, with a high near 32. Wind chill values between 15 and 25. Calm wind becoming west 5 to 7 mph in the morning.
Tuesday Night
A 20 percent chance of snow after 1am. Mostly cloudy, with a low around 22. Calm wind.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 32.
Wednesday Night
Partly cloudy, with a low around 14.
Thursday
Mostly sunny, with a high near 28.
Thursday Night
Partly cloudy, with a low around 13.
Friday
A 30 percent chance of snow after 1pm. Mostly cloudy, with a high near 31.
Friday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 9.
Saturday
Mostly sunny and cold, with a high near 18. Blustery.
Saturday Night
Partly cloudy, with a low around 4. Blustery.
Sunday
Mostly sunny and cold, with a high near 19.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
12:53 am EST Feb 2, 2026
Forecast Valid:
1am EST Feb 2, 2026-6pm EST Feb 8, 2026
 
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Additional Resources

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