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

32°F

0°C

Humidity 61%
Wind Speed Calm
Barometer 30.30 in (1026.1 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Last update 1 Dec 8:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a steady temperature around 34. Calm wind becoming east 5 to 7 mph after midnight.

    Low: 34 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Rain. High near 48. Southeast wind 8 to 18 mph becoming north in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    High: 48 °F

    Rain

  • Tuesday Night

    Tuesday Night: Rain, mainly before 10pm. Low around 31. Wind chill values between 20 and 25. Blustery, with a northwest wind 18 to 22 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 31 °F

    Blustery.
    Rain then
    Slight Chance
    Rain

  • Wednesday

    Wednesday: Sunny, with a high near 42. Wind chill values between 20 and 30. Northwest wind 8 to 15 mph, with gusts as high as 26 mph.

    High: 42 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 30. West wind 5 to 10 mph.

    Low: 30 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 43.

    High: 43 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 20.

    Low: 20 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 38.

    High: 38 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy
    then Chance
    Rain

Detailed Forecast

Tonight
Mostly cloudy, with a steady temperature around 34. Calm wind becoming east 5 to 7 mph after midnight.
Tuesday
Rain. High near 48. Southeast wind 8 to 18 mph becoming north in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Tuesday Night
Rain, mainly before 10pm. Low around 31. Wind chill values between 20 and 25. Blustery, with a northwest wind 18 to 22 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Wednesday
Sunny, with a high near 42. Wind chill values between 20 and 30. Northwest wind 8 to 15 mph, with gusts as high as 26 mph.
Wednesday Night
Partly cloudy, with a low around 30. West wind 5 to 10 mph.
Thursday
Partly sunny, with a high near 43.
Thursday Night
Mostly clear, with a low around 20.
Friday
Mostly sunny, with a high near 38.
Friday Night
A 30 percent chance of rain after 1am. Mostly cloudy, with a low around 27.
Saturday
A 30 percent chance of rain before 1pm. Partly sunny, with a high near 44.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Partly sunny, with a high near 43.
Sunday Night
Mostly cloudy, with a low around 24.
Monday
Mostly sunny, with a high near 36.
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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:
1:21 pm EST Dec 1, 2025
Forecast Valid:
9pm EST Dec 1, 2025-6pm EST Dec 8, 2025
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation