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

37°F

3°C

Humidity 89%
Wind Speed Calm
Barometer 29.91 in (1013.0 mb)
Dewpoint 34°F (1°C)
Visibility 10.00 mi
Last update 6 Dec 6:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: A chance of drizzle, mainly before 10am. Mostly cloudy, with a high near 44. Calm wind becoming west 5 to 9 mph in the morning.

    High: 44 °F

    Chance
    Drizzle

  • Tonight

    Tonight: Partly cloudy, with a low around 30. West wind 6 to 8 mph.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, with a high near 44. Northwest wind 5 to 7 mph becoming southwest in the afternoon.

    High: 44 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 26. Wind chill values between 20 and 25. West wind 6 to 16 mph.

    Low: 26 °F

    Mostly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 34. Breezy, with a north wind 15 to 21 mph, with gusts as high as 32 mph.

    High: 34 °F

    Mostly Sunny
    and Breezy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 40.

    High: 40 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 32.

    Low: 32 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 50.

    High: 50 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Today
A chance of drizzle, mainly before 10am. Mostly cloudy, with a high near 44. Calm wind becoming west 5 to 9 mph in the morning.
Tonight
Partly cloudy, with a low around 30. West wind 6 to 8 mph.
Sunday
Partly sunny, with a high near 44. Northwest wind 5 to 7 mph becoming southwest in the afternoon.
Sunday Night
Mostly cloudy, with a low around 26. Wind chill values between 20 and 25. West wind 6 to 16 mph.
Monday
Mostly sunny, with a high near 34. Breezy, with a north wind 15 to 21 mph, with gusts as high as 32 mph.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Partly sunny, with a high near 40.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
A 30 percent chance of rain after 1pm. Mostly cloudy, with a high near 50.
Wednesday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 35.
Thursday
A 30 percent chance of rain. Partly sunny, with a high near 45.
Thursday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 27.
Friday
A 30 percent chance of rain. Partly sunny, with a high near 40.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
5:44 am EST Dec 6, 2025
Forecast Valid:
7am EST Dec 6, 2025-6pm EST Dec 12, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation