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.

Mostly Cloudy

40°F

4°C

Humidity 53%
Wind Speed S 7 mph
Barometer 29.84 in (1010.7 mb)
Dewpoint 24°F (-4°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 26 Feb 3:56 pm EST
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: A slight chance of rain and snow showers. Cloudy, with a high near 38. Calm wind. Chance of precipitation is 20%.

    High: 38 °F

    Slight Chance
    Rain/Snow

  • Tonight

    Tonight: Cloudy during the early evening, then gradual clearing, with a low around 24. Calm wind.

    Low: 24 °F

    Gradual
    Clearing

  • Friday

    Friday: Sunny, with a high near 39. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.

    High: 39 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 30. Calm wind.

    Low: 30 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 45. South wind 3 to 6 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 37.

    High: 37 °F

    Partly Sunny

  • Sunday Night

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

    Low: 18 °F

    Partly Cloudy

  • Monday

    Monday: A 30 percent chance of snow after 1pm. Partly sunny, with a high near 29.

    High: 29 °F

    Partly Sunny
    then Chance
    Snow

Detailed Forecast

This Afternoon
A slight chance of rain and snow showers. Cloudy, with a high near 38. Calm wind. Chance of precipitation is 20%.
Tonight
Cloudy during the early evening, then gradual clearing, with a low around 24. Calm wind.
Friday
Sunny, with a high near 39. Wind chill values between 25 and 35. Calm wind becoming south around 5 mph.
Friday Night
Mostly clear, with a low around 30. Calm wind.
Saturday
Mostly sunny, with a high near 45. South wind 3 to 6 mph.
Saturday Night
Partly cloudy, with a low around 29.
Sunday
Partly sunny, with a high near 37.
Sunday Night
Partly cloudy, with a low around 18.
Monday
A 30 percent chance of snow after 1pm. Partly sunny, with a high near 29.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
Partly sunny, with a high near 38.
Tuesday Night
A chance of rain and snow. Mostly cloudy, with a low around 30. Chance of precipitation is 50%.
Wednesday
A 40 percent chance of rain. Partly sunny, with a high near 44.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 31.
Thursday
A chance of rain. Mostly cloudy, with a high near 45.
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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:
12:59 pm EST Feb 26, 2026
Forecast Valid:
4pm EST Feb 26, 2026-6pm EST Mar 5, 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