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.

A Few Clouds and Breezy

49°F

9°C

Humidity 29%
Wind Speed NW 21 G 32 mph
Barometer 30.07 in (1018.1 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill42°F (6°C)
Last update 14 Mar 4:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Increasing clouds, with a low around 31. West wind 12 to 17 mph becoming light northwest after midnight. Winds could gust as high as 31 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Partly sunny, with a high near 47. Northeast wind 5 to 13 mph becoming southeast in the afternoon.

    High: 47 °F

    Partly Sunny

  • Sunday Night

    Sunday Night: Showers after 2am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 10 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 40 °F⇑

    Mostly Cloudy
    then Showers

  • Monday

    Monday: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 58. Breezy, with a south wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 58 °F

    Heavy Rain
    and Breezy

  • Monday Night

    Monday Night: Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 33. Windy, with a south wind 23 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 33 °F

    Heavy Rain
    and Windy

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Mostly sunny, with a high near 42. Breezy.

    High: 42 °F

    Breezy.
    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

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

    Low: 28 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 31. West wind 12 to 17 mph becoming light northwest after midnight. Winds could gust as high as 31 mph.
Sunday
Partly sunny, with a high near 47. Northeast wind 5 to 13 mph becoming southeast in the afternoon.
Sunday Night
Showers after 2am. Temperature falling to near 40 by 9pm, then rising to around 48 during the remainder of the night. Southeast wind 10 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Monday
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. High near 58. Breezy, with a south wind 20 to 25 mph, with gusts as high as 40 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Showers and possibly a thunderstorm. Some of the storms could produce heavy rainfall. Low around 33. Windy, with a south wind 23 to 28 mph, with gusts as high as 50 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Tuesday
A 30 percent chance of showers before 8am. Mostly sunny, with a high near 42. Breezy.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 37.
Wednesday Night
Mostly cloudy, with a low around 28.
Thursday
Mostly sunny, with a high near 45.
Thursday Night
Mostly cloudy, with a low around 33.
Friday
Mostly sunny, with a high near 49.
Friday Night
Partly cloudy, with a low around 35.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 49.
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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:
2:22 pm EDT Mar 14, 2026
Forecast Valid:
5pm EDT Mar 14, 2026-6pm EDT Mar 21, 2026
 
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Additional Resources

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