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

27°F

-3°C

Humidity 43%
Wind Speed W 18 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 7°F (-14°C)
Visibility 10.00 mi
Wind Chill14°F (-10°C)
Last update 16 Jan 10:56 am EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Sunny, with a high near 36. Wind chill values between 15 and 25. West wind 10 to 15 mph, with gusts as high as 26 mph.

    High: 36 °F

    Sunny

  • Tonight

    Tonight: A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28. South wind around 6 mph.

    Low: 28 °F

    Partly Cloudy
    then Chance
    Snow

  • Saturday

    Saturday: A chance of rain before 10am, then rain likely, possibly mixed with snow. Mostly cloudy, with a high near 41. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 41 °F

    Rain/Snow
    Likely

  • Saturday Night

    Saturday Night: A slight chance of snow before 7pm, then a slight chance of snow after 1am. Mostly cloudy, with a low around 30. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 30 °F

    Mostly Cloudy
    then Slight
    Chance Snow

  • Sunday

    Sunday: A chance of rain and snow before 4pm, then a chance of snow. Cloudy, with a high near 36. Light west wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 30%.

    High: 36 °F

    Chance
    Rain/Snow

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 21.

    Low: 21 °F

    Partly Cloudy

  • M.L.King Day

    M.L.King Day: Sunny, with a high near 34.

    High: 34 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 15.

    Low: 15 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 23.

    High: 23 °F

    Sunny

Detailed Forecast

Today
Sunny, with a high near 36. Wind chill values between 15 and 25. West wind 10 to 15 mph, with gusts as high as 26 mph.
Tonight
A 30 percent chance of snow after 1am. Mostly cloudy, with a low around 28. South wind around 6 mph.
Saturday
A chance of rain before 10am, then rain likely, possibly mixed with snow. Mostly cloudy, with a high near 41. Southwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Saturday Night
A slight chance of snow before 7pm, then a slight chance of snow after 1am. Mostly cloudy, with a low around 30. West wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.
Sunday
A chance of rain and snow before 4pm, then a chance of snow. Cloudy, with a high near 36. Light west wind increasing to 5 to 9 mph in the morning. Chance of precipitation is 30%.
Sunday Night
Partly cloudy, with a low around 21.
M.L.King Day
Sunny, with a high near 34.
Monday Night
Mostly clear, with a low around 15.
Tuesday
Sunny, with a high near 23.
Tuesday Night
Mostly clear, with a low around 13.
Wednesday
Mostly sunny, with a high near 33.
Wednesday Night
Mostly cloudy, with a low around 24.
Thursday
Partly sunny, with a high near 37.
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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:
11:24 am EST Jan 16, 2026
Forecast Valid:
11am EST Jan 16, 2026-6pm EST Jan 22, 2026
 
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