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.

Overcast

41°F

5°C

Humidity 89%
Wind Speed Calm
Barometer 30.08 in (1018.5 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 7 Apr 4:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Overnight

    Overnight: A 20 percent chance of showers. Mostly cloudy, with a low around 39. Southeast wind around 6 mph.

    Low: 39 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: Partly sunny, with a high near 53. Breezy, with a southwest wind 8 to 13 mph becoming northwest 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.

    High: 53 °F

    Partly Sunny
    then Mostly
    Sunny and
    Breezy

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 28. Wind chill values between 20 and 25. North wind 11 to 18 mph.

    Low: 28 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 46. Wind chill values between 20 and 30 early. North wind around 10 mph becoming southeast in the afternoon.

    High: 46 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 30. South wind 3 to 6 mph.

    Low: 30 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 38.

    Low: 38 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 57.

    High: 57 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 44.

    Low: 44 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 20 percent chance of showers. Mostly cloudy, with a low around 39. Southeast wind around 6 mph.
Tuesday
Partly sunny, with a high near 53. Breezy, with a southwest wind 8 to 13 mph becoming northwest 17 to 22 mph in the afternoon. Winds could gust as high as 33 mph.
Tuesday Night
Mostly clear, with a low around 28. Wind chill values between 20 and 25. North wind 11 to 18 mph.
Wednesday
Sunny, with a high near 46. Wind chill values between 20 and 30 early. North wind around 10 mph becoming southeast in the afternoon.
Wednesday Night
Mostly clear, with a low around 30. South wind 3 to 6 mph.
Thursday
Mostly sunny, with a high near 50.
Thursday Night
Partly cloudy, with a low around 38.
Friday
Mostly sunny, with a high near 57.
Friday Night
Partly cloudy, with a low around 44.
Saturday
Mostly sunny, with a high near 64.
Saturday Night
Mostly clear, with a low around 42.
Sunday
Sunny, with a high near 57.
Sunday Night
Mostly cloudy, with a low around 45.
Monday
Partly sunny, with a high near 63.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
4:36 am EDT Apr 7, 2026
Forecast Valid:
5am EDT Apr 7, 2026-6pm EDT Apr 13, 2026
 
Forecast Discussion
 
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Additional Resources

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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