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.

Overcast

41°F

5°C

Humidity 57%
Wind Speed SW 10 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 27°F (-3°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 22 Jan 4:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: 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

  • Tonight

    Tonight: Partly cloudy, with a low around 27. West wind around 9 mph, with gusts as high as 20 mph.

    Low: 27 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 36. Wind chill values between 20 and 25. West wind 7 to 15 mph, with gusts as high as 28 mph.

    High: 36 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Northwest wind 10 to 14 mph, with gusts as high as 28 mph.

    Low: 10 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny and cold, with a high near 19. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.

    High: 19 °F

    Cold

  • Saturday Night

    Saturday Night: Snow likely after 1am. Mostly cloudy, with a steady temperature around 15. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.

    Low: 15 °F

    Mostly Cloudy
    then Snow
    Likely

  • Sunday

    Sunday: Snow. High near 25. Chance of precipitation is 90%.

    High: 25 °F

    Snow

  • Sunday Night

    Sunday Night: Snow. Low around 19. Chance of precipitation is 80%.

    Low: 19 °F

    Snow

  • Monday

    Monday: A 40 percent chance of snow. Mostly cloudy, with a high near 28.

    High: 28 °F

    Chance Snow

Detailed Forecast

Today
Mostly sunny, with a high near 44. West wind 10 to 14 mph, with gusts as high as 25 mph.
Tonight
Partly cloudy, with a low around 27. West wind around 9 mph, with gusts as high as 20 mph.
Friday
Mostly sunny, with a high near 36. Wind chill values between 20 and 25. West wind 7 to 15 mph, with gusts as high as 28 mph.
Friday Night
Partly cloudy, with a low around 10. Wind chill values between -5 and 5. Northwest wind 10 to 14 mph, with gusts as high as 28 mph.
Saturday
Partly sunny and cold, with a high near 19. Northwest wind 8 to 10 mph, with gusts as high as 20 mph.
Saturday Night
Snow likely after 1am. Mostly cloudy, with a steady temperature around 15. Chance of precipitation is 60%. New snow accumulation of 1 to 3 inches possible.
Sunday
Snow. High near 25. Chance of precipitation is 90%.
Sunday Night
Snow. Low around 19. Chance of precipitation is 80%.
Monday
A 40 percent chance of snow. Mostly cloudy, with a high near 28.
Monday Night
Partly cloudy, with a low around 11.
Tuesday
Mostly sunny, with a high near 25.
Tuesday Night
Partly cloudy, with a low around 14.
Wednesday
Partly sunny, with a high near 28.
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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:
1:01 am EST Jan 22, 2026
Forecast Valid:
5am EST Jan 22, 2026-6pm EST Jan 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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