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Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds and Windy

37°F

3°C

Humidity 41%
Wind Speed W 28 G 36 mph
Barometer 29.74 in (1007.2 mb)
Dewpoint 15°F (-9°C)
Visibility 10.00 mi
Wind Chill25°F (-4°C)
Last update 17 Mar 8:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Mostly sunny, with a high near 42. Wind chill values between 25 and 35. Breezy, with a west wind 17 to 22 mph, with gusts as high as 33 mph.

    High: 42 °F

    Mostly Sunny
    and Breezy

  • Tonight

    Tonight: A chance of flurries before 11pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind 9 to 13 mph.

    Low: 24 °F

    Chance
    Flurries

  • Wednesday

    Wednesday: Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 5 to 8 mph.

    High: 37 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 25. Light south wind.

    Low: 25 °F

    Partly Cloudy

  • 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: Partly cloudy, with a low around 33.

    Low: 33 °F

    Partly Cloudy

  • Friday

    Friday: Partly sunny, with a high near 48.

    High: 48 °F

    Partly Sunny

  • Friday Night

    Friday Night: A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 37.

    Low: 37 °F

    Mostly Cloudy
    then Chance
    Rain

  • Saturday

    Saturday: A 30 percent chance of rain before 2pm. Partly sunny, with a high near 50.

    High: 50 °F

    Chance Rain

Detailed Forecast

Today
Mostly sunny, with a high near 42. Wind chill values between 25 and 35. Breezy, with a west wind 17 to 22 mph, with gusts as high as 33 mph.
Tonight
A chance of flurries before 11pm. Partly cloudy, with a low around 24. Wind chill values between 15 and 20. Northwest wind 9 to 13 mph.
Wednesday
Mostly sunny, with a high near 37. Wind chill values between 15 and 25. Northwest wind 5 to 8 mph.
Wednesday Night
Partly cloudy, with a low around 25. Light south wind.
Thursday
Mostly sunny, with a high near 43. Calm wind becoming south 5 to 7 mph in the afternoon.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Partly sunny, with a high near 48.
Friday Night
A 30 percent chance of rain after 2am. Mostly cloudy, with a low around 37.
Saturday
A 30 percent chance of rain before 2pm. Partly sunny, with a high near 50.
Saturday Night
A 30 percent chance of rain after 8pm. Mostly cloudy, with a low around 35.
Sunday
A 30 percent chance of rain. Mostly cloudy, with a high near 50.
Sunday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 32.
Monday
Partly sunny, with a high near 45.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 ft)
Last Update:
7:54 am EDT Mar 17, 2026
Forecast Valid:
9am EDT Mar 17, 2026-6pm EDT Mar 23, 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