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.

Partly Cloudy

38°F

3°C

Humidity 29%
Wind Speed N 14 G 20 mph
Barometer 30.39 in (1029.3 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 28 Mar 3:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 30. Northwest wind 5 to 7 mph becoming calm after midnight. Winds could gust as high as 25 mph.

    Low: 30 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 48. Light southwest wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph.

    High: 48 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 40. Southwest wind 9 to 11 mph, with gusts as high as 24 mph.

    Low: 40 °F

    Increasing
    Clouds

  • Monday

    Monday: Partly sunny, with a high near 57. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.

    High: 57 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 46. Southwest wind 5 to 7 mph.

    Low: 46 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 63.

    High: 63 °F

    Chance
    Showers then
    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 49.

    Low: 49 °F

    Partly Cloudy

  • Wednesday

    Wednesday: A 40 percent chance of rain after 2pm. Partly sunny, with a high near 63.

    High: 63 °F

    Mostly Sunny
    then Chance
    Rain

  • Wednesday Night

    Wednesday Night: Rain likely, mainly after 8pm. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.

    Low: 38 °F

    Rain Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 30. Northwest wind 5 to 7 mph becoming calm after midnight. Winds could gust as high as 25 mph.
Sunday
Sunny, with a high near 48. Light southwest wind becoming south 8 to 13 mph in the morning. Winds could gust as high as 23 mph.
Sunday Night
Increasing clouds, with a low around 40. Southwest wind 9 to 11 mph, with gusts as high as 24 mph.
Monday
Partly sunny, with a high near 57. Southwest wind 9 to 14 mph, with gusts as high as 24 mph.
Monday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 46. Southwest wind 5 to 7 mph.
Tuesday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
A 40 percent chance of rain after 2pm. Partly sunny, with a high near 63.
Wednesday Night
Rain likely, mainly after 8pm. Mostly cloudy, with a low around 38. Chance of precipitation is 70%.
Thursday
A 50 percent chance of rain. Mostly cloudy, with a high near 46.
Thursday Night
Rain and snow likely. Cloudy, with a low around 35. Chance of precipitation is 60%.
Friday
Rain and snow likely. Cloudy, with a high near 46. Chance of precipitation is 60%.
Friday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 60%.
Saturday
A 40 percent chance of rain. Mostly cloudy, with a high near 49.
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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:
2:35 pm EDT Mar 28, 2026
Forecast Valid:
4pm EDT Mar 28, 2026-6pm EDT Apr 4, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation