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

36°F

2°C

Humidity 34%
Wind Speed W 13 G 23 mph
Barometer 30.00 in (1015.9 mb)
Dewpoint 10°F (-12°C)
Visibility 10.00 mi
Wind Chill27°F (-3°C)
Last update 17 Mar 7:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind 10 to 13 mph.

    Low: 24 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 5 to 7 mph becoming calm in the afternoon.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 26. Light south wind.

    Low: 26 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 43. Calm wind becoming south 5 to 9 mph in the morning.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. South wind 3 to 5 mph.

    Low: 33 °F

    Partly Cloudy
    then Slight
    Chance Snow
    Showers

  • Friday

    Friday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 36.

    Low: 36 °F

    Mostly Cloudy

  • Saturday

    Saturday: A 30 percent chance of rain. Partly sunny, with a high near 50.

    High: 50 °F

    Chance Rain

  • Saturday Night

    Saturday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 38.

    Low: 38 °F

    Chance Rain

Detailed Forecast

Tonight
Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind 10 to 13 mph.
Wednesday
Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 5 to 7 mph becoming calm in the afternoon.
Wednesday Night
Mostly clear, with a low around 26. Light south wind.
Thursday
Mostly sunny, with a high near 43. Calm wind becoming south 5 to 9 mph in the morning.
Thursday Night
A 20 percent chance of snow showers after 2am. Mostly cloudy, with a low around 33. South wind 3 to 5 mph.
Friday
Partly sunny, with a high near 49.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 50.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 38.
Sunday
Mostly cloudy, with a high near 52.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 34.
Monday
Sunny, with a high near 47.
Monday Night
Mostly clear, with a low around 27.
Tuesday
Sunny, with a high near 43.
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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:
7:30 pm EDT Mar 17, 2026
Forecast Valid:
8pm EDT Mar 17, 2026-6pm EDT Mar 24, 2026
 
Forecast Discussion
 
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Additional Resources

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High Temperature

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Chance of Precipitation