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

38°F

3°C

Humidity 39%
Wind Speed S 8 mph
Barometer 30.13 in (1020.2 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 27 Feb 11:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 41. South wind 3 to 5 mph.

    High: 41 °F

    Sunny

  • Tonight

    Tonight: Mostly clear, with a low around 28. Light south wind.

    Low: 28 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 47. Southwest wind 3 to 7 mph.

    High: 47 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 30. Light and variable wind.

    Low: 30 °F

    Partly Cloudy

  • Sunday

    Sunday: Scattered snow showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 38. Northwest wind 6 to 11 mph. Chance of precipitation is 40%.

    High: 38 °F

    Scattered
    Snow Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 28.

    High: 28 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 19.

    Low: 19 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow after 1pm. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.

    High: 38 °F

    Partly Sunny
    then Chance
    Rain/Snow

Detailed Forecast

This Afternoon
Sunny, with a high near 41. South wind 3 to 5 mph.
Tonight
Mostly clear, with a low around 28. Light south wind.
Saturday
Mostly sunny, with a high near 47. Southwest wind 3 to 7 mph.
Saturday Night
Partly cloudy, with a low around 30. Light and variable wind.
Sunday
Scattered snow showers before 1pm. Cloudy through mid morning, then gradual clearing, with a high near 38. Northwest wind 6 to 11 mph. Chance of precipitation is 40%.
Sunday Night
Partly cloudy, with a low around 17.
Monday
Mostly cloudy, with a high near 28.
Monday Night
Mostly cloudy, with a low around 19.
Tuesday
A chance of rain and snow after 1pm. Mostly cloudy, with a high near 38. Chance of precipitation is 30%.
Tuesday Night
Rain likely. Cloudy, with a low around 30. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain. Partly sunny, with a high near 43.
Wednesday Night
Mostly cloudy, with a low around 32.
Thursday
A 30 percent chance of rain. Mostly cloudy, with a high near 44.
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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:
12:50 am EST Feb 27, 2026
Forecast Valid:
12pm EST Feb 27, 2026-6pm EST Mar 5, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation