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.

Fair

30°F

-1°C

Humidity 85%
Wind Speed Calm
Barometer 30.17 in (1021.5 mb)
Dewpoint 26°F (-3°C)
Visibility 10.00 mi
Last update 27 Feb 9:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, partly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Mostly Clear
    then Patchy
    Fog

  • Saturday

    Saturday: Mostly sunny, with a high near 45. Calm wind becoming southwest around 6 mph.

    High: 45 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 29. Calm wind.

    Low: 29 °F

    Partly Cloudy

  • Sunday

    Sunday: Snow showers likely, mainly between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 38. Northwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

    High: 38 °F

    Snow Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 17. North wind around 10 mph.

    Low: 17 °F

    Chance Snow
    Showers then
    Partly Cloudy

  • Monday

    Monday: Partly sunny, with a high near 28.

    High: 28 °F

    Partly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 20.

    Low: 20 °F

    Partly Cloudy

  • Tuesday

    Tuesday: A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.

    High: 41 °F

    Chance
    Rain/Snow

  • Tuesday Night

    Tuesday Night: Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.

    Low: 37 °F

    Rain Likely

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, partly cloudy, with a low around 29. Calm wind.
Saturday
Mostly sunny, with a high near 45. Calm wind becoming southwest around 6 mph.
Saturday Night
Partly cloudy, with a low around 29. Calm wind.
Sunday
Snow showers likely, mainly between 10am and 4pm. Cloudy, then gradually becoming mostly sunny, with a high near 38. Northwest wind 5 to 10 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Sunday Night
A 30 percent chance of snow showers before 7pm. Partly cloudy, with a low around 17. North wind around 10 mph.
Monday
Partly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 20.
Tuesday
A chance of rain and snow before 1pm, then a chance of rain. Mostly cloudy, with a high near 41. Chance of precipitation is 50%.
Tuesday Night
Rain likely. Cloudy, with a low around 37. Chance of precipitation is 70%.
Wednesday
A 30 percent chance of rain before 1pm. Mostly cloudy, with a high near 45.
Wednesday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 33.
Thursday
A 40 percent chance of rain. Cloudy, with a high near 45.
Thursday Night
Rain likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Friday
A 40 percent chance of rain. Cloudy, with a high near 43.
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Forecast Area
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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:
8:51 pm EST Feb 27, 2026
Forecast Valid:
10pm EST Feb 27, 2026-6pm EST Mar 6, 2026
 
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Additional Resources

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