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.

Partly Cloudy

43°F

6°C

Humidity 27%
Wind Speed NW 16 G 26 mph
Barometer 29.85 in (1010.8 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 17 Mar 3:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Scattered flurries after 5pm. Partly sunny, with a high near 41. West wind 15 to 17 mph, with gusts as high as 29 mph.

    High: 41 °F

    Scattered
    Flurries

  • Tonight

    Tonight: Scattered flurries before 11pm. Partly cloudy, with a low around 24. Northwest wind 6 to 9 mph, with gusts as high as 22 mph.

    Low: 24 °F

    Scattered
    Flurries

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northwest wind around 5 mph becoming calm in the afternoon.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 27. Calm wind.

    Low: 27 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 43. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 43 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 33.

    Low: 33 °F

    Mostly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 48.

    High: 48 °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 49.

    High: 49 °F

    Chance Rain

Detailed Forecast

This Afternoon
Scattered flurries after 5pm. Partly sunny, with a high near 41. West wind 15 to 17 mph, with gusts as high as 29 mph.
Tonight
Scattered flurries before 11pm. Partly cloudy, with a low around 24. Northwest wind 6 to 9 mph, with gusts as high as 22 mph.
Wednesday
Mostly sunny, with a high near 37. Wind chill values between 20 and 30. Northwest wind around 5 mph becoming calm in the afternoon.
Wednesday Night
Mostly clear, with a low around 27. Calm wind.
Thursday
Mostly sunny, with a high near 43. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Mostly cloudy, with a low around 33.
Friday
Partly sunny, with a high near 48.
Friday Night
Mostly cloudy, with a low around 36.
Saturday
A 30 percent chance of rain. Partly sunny, with a high near 49.
Saturday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 37.
Sunday
Mostly cloudy, with a high near 51.
Sunday Night
A 40 percent chance of rain. Mostly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 50.
Monday Night
Mostly clear, with a low around 28.
Tuesday
Sunny, with a high near 43.
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
2:58 pm EDT Mar 17, 2026
Forecast Valid:
4pm EDT Mar 17, 2026-6pm EDT Mar 24, 2026
 
Forecast Discussion
 
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