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.

N/A

Humidity NA
Wind Speed NA
Barometer NA
Dewpoint N/A
Visibility NA
Last update *** Not a current observation ***
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A slight chance of snow before 4am, then a chance of flurries after 4am. Cloudy, with a low around 18. Wind chill values between 10 and 15. West wind around 7 mph. Chance of precipitation is 20%.

    Low: 18 °F

    Slight Chance
    Snow

  • Friday

    Friday: A chance of flurries before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 30 °F

    Chance
    Flurries

  • Friday Night

    Friday Night: Partly cloudy, with a low around 19. Wind chill values between 10 and 15. West wind around 6 mph.

    Low: 19 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 31. Wind chill values between 10 and 20. West wind 6 to 9 mph.

    High: 31 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: A 30 percent chance of snow after 1am. Cloudy, with a low around 23. Calm wind.

    Low: 23 °F

    Cloudy then
    Chance Snow

  • Sunday

    Sunday: Cloudy, then gradually becoming mostly sunny, with a high near 33.

    High: 33 °F

    Decreasing
    Clouds

  • Sunday Night

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

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 34.

    High: 34 °F

    Partly Sunny

  • Monday Night

    Monday Night: Cloudy, with a low around 25.

    Low: 25 °F

    Cloudy

Detailed Forecast

Overnight
A slight chance of snow before 4am, then a chance of flurries after 4am. Cloudy, with a low around 18. Wind chill values between 10 and 15. West wind around 7 mph. Chance of precipitation is 20%.
Friday
A chance of flurries before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 30. Wind chill values between 10 and 20. West wind 7 to 10 mph, with gusts as high as 20 mph.
Friday Night
Partly cloudy, with a low around 19. Wind chill values between 10 and 15. West wind around 6 mph.
Saturday
Partly sunny, with a high near 31. Wind chill values between 10 and 20. West wind 6 to 9 mph.
Saturday Night
A 30 percent chance of snow after 1am. Cloudy, with a low around 23. Calm wind.
Sunday
Cloudy, then gradually becoming mostly sunny, with a high near 33.
Sunday Night
Partly cloudy, with a low around 18.
Monday
Partly sunny, with a high near 34.
Monday Night
Cloudy, with a low around 25.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Mostly cloudy, with a low around 31.
Thursday
Mostly sunny, with a high near 44.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
12:31 am EST Jan 2, 2026
Forecast Valid:
3am EST Jan 2, 2026-6pm EST Jan 8, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation