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.

A Few Clouds

27°F

-3°C

Humidity 72%
Wind Speed NW 5 mph
Barometer 29.88 in (1011.8 mb)
Dewpoint 19°F (-7°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 12 Feb 4:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly sunny, with a high near 35. Wind chill values between 15 and 25. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.

    High: 35 °F

    Mostly Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 23 mph.

    Low: 19 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 13 mph.

    High: 34 °F

    Sunny

  • Friday Night

    Friday Night: A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 5 to 7 mph.

    Low: 24 °F

    Chance Snow
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 40. West wind 8 to 13 mph.

    High: 40 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 25.

    Low: 25 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 38.

    High: 38 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.

    Low: 28 °F

    Chance
    Rain/Snow

  • Washington's Birthday

    Washington's Birthday: A chance of rain and snow before 1pm. Mostly sunny, with a high near 41. Chance of precipitation is 30%.

    High: 41 °F

    Chance
    Rain/Snow

Detailed Forecast

Today
Mostly sunny, with a high near 35. Wind chill values between 15 and 25. Northwest wind 13 to 16 mph, with gusts as high as 28 mph.
Tonight
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. Northwest wind 7 to 11 mph, with gusts as high as 23 mph.
Friday
Sunny, with a high near 34. Wind chill values between 10 and 20. Northwest wind 7 to 13 mph.
Friday Night
A 30 percent chance of snow showers, mainly after 10pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. West wind 5 to 7 mph.
Saturday
Mostly sunny, with a high near 40. West wind 8 to 13 mph.
Saturday Night
Partly cloudy, with a low around 25.
Sunday
Mostly cloudy, with a high near 38.
Sunday Night
A chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
Washington's Birthday
A chance of rain and snow before 1pm. Mostly sunny, with a high near 41. Chance of precipitation is 30%.
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. Cloudy, with a high near 43.
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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:
2:21 am EST Feb 12, 2026
Forecast Valid:
5am EST Feb 12, 2026-6pm EST Feb 18, 2026
 
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Additional Resources

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