National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

26°F

-3°C

Humidity 40%
Wind Speed W 9 mph
Barometer 30.51 in (1033.4 mb)
Dewpoint 5°F (-15°C)
Visibility 10.00 mi
Wind Chill17°F (-8°C)
Last update 21 Jan 10:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Partly sunny, with a high near 37. Wind chill values between 20 and 30. South wind 8 to 11 mph, with gusts as high as 21 mph.

    High: 37 °F

    Partly Sunny

  • Tonight

    Tonight: A chance of rain and snow, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 37. Southwest wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 37 °F

    Chance
    Rain/Snow

  • Thursday

    Thursday: Mostly sunny, with a high near 44. West wind 10 to 14 mph, with gusts as high as 25 mph.

    High: 44 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 26. West wind 7 to 9 mph, with gusts as high as 20 mph.

    Low: 26 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 35. West wind 7 to 13 mph, with gusts as high as 23 mph.

    High: 35 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 18.

    High: 18 °F

    Cold

  • Saturday Night

    Saturday Night: A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 10.

    Low: 10 °F

    Mostly Cloudy
    then Chance
    Snow

  • Sunday

    Sunday: Snow likely. Cloudy, with a high near 23. Chance of precipitation is 70%.

    High: 23 °F

    Snow Likely

Detailed Forecast

Today
Partly sunny, with a high near 37. Wind chill values between 20 and 30. South wind 8 to 11 mph, with gusts as high as 21 mph.
Tonight
A chance of rain and snow, mainly before 1am. Cloudy, then gradually becoming partly cloudy, with a steady temperature around 37. Southwest wind 10 to 14 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Thursday
Mostly sunny, with a high near 44. West wind 10 to 14 mph, with gusts as high as 25 mph.
Thursday Night
Partly cloudy, with a low around 26. West wind 7 to 9 mph, with gusts as high as 20 mph.
Friday
Partly sunny, with a high near 35. West wind 7 to 13 mph, with gusts as high as 23 mph.
Friday Night
Mostly cloudy, with a low around 10.
Saturday
Partly sunny and cold, with a high near 18.
Saturday Night
A 50 percent chance of snow after 1am. Mostly cloudy, with a low around 10.
Sunday
Snow likely. Cloudy, with a high near 23. Chance of precipitation is 70%.
Sunday Night
Snow likely. Cloudy, with a low around 16. Chance of precipitation is 60%.
Monday
A 40 percent chance of snow. Partly sunny, with a high near 27.
Monday Night
Partly cloudy, with a low around 14.
Tuesday
Mostly sunny, with a high near 26.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
1:12 am EST Jan 21, 2026
Forecast Valid:
11am EST Jan 21, 2026-6pm EST Jan 27, 2026
 
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Additional Resources

Radar & Satellite Image

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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