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

39°F

4°C

Humidity 50%
Wind Speed SW 14 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill31°F (-1°C)
Last update 13 Mar 3:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a southwest wind 14 to 20 mph. Chance of precipitation is 20%.

    Low: 38 °F

    Slight Chance
    Showers and
    Breezy

  • Saturday

    Saturday: Sunny, with a high near 49. Breezy, with a west wind 17 to 21 mph, with gusts as high as 38 mph.

    High: 49 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Northwest wind 5 to 10 mph becoming light after midnight.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 48. Northeast wind 5 to 10 mph becoming southeast in the afternoon.

    High: 48 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain after 2am. Low around 39. Southeast wind 11 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Mostly Cloudy
    then Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 2pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 56 °F

    Rain

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Low around 35. Chance of precipitation is 90%.

    Low: 35 °F

    Rain

  • Tuesday

    Tuesday: A 30 percent chance of rain before 8am. Mostly sunny, with a high near 45.

    High: 45 °F

    Chance Rain
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 24.

    Low: 24 °F

    Mostly Clear

Detailed Forecast

Tonight
A slight chance of showers between 11pm and 2am. Mostly cloudy, then gradually becoming mostly clear, with a low around 38. Breezy, with a southwest wind 14 to 20 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 49. Breezy, with a west wind 17 to 21 mph, with gusts as high as 38 mph.
Saturday Night
Increasing clouds, with a low around 32. Northwest wind 5 to 10 mph becoming light after midnight.
Sunday
Mostly cloudy, with a high near 48. Northeast wind 5 to 10 mph becoming southeast in the afternoon.
Sunday Night
Rain after 2am. Low around 39. Southeast wind 11 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain, with thunderstorms also possible after 2pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain and possibly a thunderstorm. Low around 35. Chance of precipitation is 90%.
Tuesday
A 30 percent chance of rain before 8am. Mostly sunny, with a high near 45.
Tuesday Night
Mostly clear, with a low around 24.
Wednesday
Mostly sunny, with a high near 39.
Wednesday Night
Mostly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Partly sunny, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.25°W (Elev. 13 ft)
Last Update:
2:26 pm EDT Mar 13, 2026
Forecast Valid:
4pm EDT Mar 13, 2026-6pm EDT Mar 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