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.

Fog/Mist

36°F

2°C

Humidity 97%
Wind Speed NW 3 mph
Barometer 29.78 in (1008.5 mb)
Dewpoint 35°F (2°C)
Visibility 2.00 mi
Last update 18 Feb 5:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Rain likely, mainly before 10pm. Cloudy, with a low around 31. Calm wind becoming northeast 5 to 7 mph after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 31 °F

    Rain Likely
    then Chance
    Rain

  • Thursday

    Thursday: Mostly cloudy, with a high near 40. Northeast wind 7 to 9 mph becoming east in the afternoon.

    High: 40 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A chance of rain and snow before 10pm, then rain likely. Cloudy, with a low around 32. East wind 3 to 7 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.

    Low: 32 °F

    Chance
    Rain/Snow
    then Rain
    Likely

  • Friday

    Friday: Rain. High near 42. East wind 9 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    High: 42 °F

    Rain

  • Friday Night

    Friday Night: Rain likely, mainly before 7pm. Mostly cloudy, with a low around 32. Northeast wind 5 to 9 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 32 °F

    Rain Likely

  • Saturday

    Saturday: A 30 percent chance of rain after 1pm. Partly sunny, with a high near 42.

    High: 42 °F

    Partly Sunny
    then Chance
    Rain

  • Saturday Night

    Saturday Night: A chance of rain before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.

    Low: 28 °F

    Chance Rain
    then Chance
    Rain/Snow

  • Sunday

    Sunday: A 40 percent chance of snow. Mostly cloudy, with a high near 36.

    High: 36 °F

    Chance Snow

  • Sunday Night

    Sunday Night: A 50 percent chance of snow. Cloudy, with a low around 27. Blustery.

    Low: 27 °F

    Chance Snow
    and Blustery

Detailed Forecast

Tonight
Rain likely, mainly before 10pm. Cloudy, with a low around 31. Calm wind becoming northeast 5 to 7 mph after midnight. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Mostly cloudy, with a high near 40. Northeast wind 7 to 9 mph becoming east in the afternoon.
Thursday Night
A chance of rain and snow before 10pm, then rain likely. Cloudy, with a low around 32. East wind 3 to 7 mph. Chance of precipitation is 60%. Little or no snow accumulation expected.
Friday
Rain. High near 42. East wind 9 to 14 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday Night
Rain likely, mainly before 7pm. Mostly cloudy, with a low around 32. Northeast wind 5 to 9 mph becoming north after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
A 30 percent chance of rain after 1pm. Partly sunny, with a high near 42.
Saturday Night
A chance of rain before 1am, then a chance of rain and snow. Mostly cloudy, with a low around 28. Chance of precipitation is 30%.
Sunday
A 40 percent chance of snow. Mostly cloudy, with a high near 36.
Sunday Night
A 50 percent chance of snow. Cloudy, with a low around 27. Blustery.
Monday
A 40 percent chance of snow before 1pm. Mostly cloudy, with a high near 36. Breezy.
Monday Night
Mostly cloudy, with a low around 24.
Tuesday
Sunny, with a high near 37.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Partly sunny, with a high near 41.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.81°N 73.11°W (Elev. 98 ft)
Last Update:
12:48 pm EST Feb 18, 2026
Forecast Valid:
6pm EST Feb 18, 2026-6pm EST Feb 25, 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