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

36°F

2°C

Humidity 57%
Wind Speed W 10 mph
Barometer 30.07 in (1018.2 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill29°F (-2°C)
Last update 14 Feb 10:56 am EST
Extended Forecast for

Islip Terrace NY

  • Today

    Today: Partly sunny, with a high near 41. West wind 7 to 10 mph.

    High: 41 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 25. Calm wind.

    Low: 25 °F

    Mostly Clear

  • Sunday

    Sunday: Partly sunny, with a high near 38. Calm wind becoming east around 6 mph in the afternoon.

    High: 38 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 29. Calm wind becoming northeast around 5 mph after midnight.

    Low: 29 °F

    Chance Snow

  • Washington's Birthday

    Washington's Birthday: Partly sunny, with a high near 40. Northeast wind 3 to 6 mph.

    High: 40 °F

    Partly Sunny

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 28.

    Low: 28 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 50 percent chance of rain. Cloudy, with a high near 42.

    High: 42 °F

    Chance Rain

Detailed Forecast

Today
Partly sunny, with a high near 41. West wind 7 to 10 mph.
Tonight
Mostly clear, with a low around 25. Calm wind.
Sunday
Partly sunny, with a high near 38. Calm wind becoming east around 6 mph in the afternoon.
Sunday Night
A 40 percent chance of snow, mainly after 1am. Mostly cloudy, with a low around 29. Calm wind becoming northeast around 5 mph after midnight.
Washington's Birthday
Partly sunny, with a high near 40. Northeast wind 3 to 6 mph.
Monday Night
Mostly cloudy, with a low around 28.
Tuesday
Partly sunny, with a high near 42.
Tuesday Night
Mostly cloudy, with a low around 33.
Wednesday
A 50 percent chance of rain. Cloudy, with a high near 42.
Wednesday Night
Rain likely before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 31. Chance of precipitation is 60%.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 42.
Thursday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 28.
Friday
A chance of rain and snow. Mostly cloudy, with a high near 39. Chance of precipitation is 50%.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
10:44 am EST Feb 14, 2026
Forecast Valid:
11am EST Feb 14, 2026-6pm EST Feb 20, 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