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

4°C

39°F

Humidity 45%
Wind Speed SW 28 G 44 km/h
Barometer 1020.0 mb (30.12 in)
Dewpoint -7°C (19°F)
Visibility 16 km
Wind Chill-1°C (30°F)
Last update 13 Mar 12:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: Mostly cloudy, with a high near 8. South wind 21 to 23 km/h.

    High: 8 °C

    Mostly Cloudy

  • Tonight

    Tonight: A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 3. South wind 24 to 29 km/h, with gusts as high as 45 km/h.

    Low: 3 °C

    Slight Chance
    Rain then
    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 9. Breezy, with a west wind 26 to 31 km/h increasing to 35 to 40 km/h in the afternoon.

    High: 9 °C

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 0. Northwest wind 8 to 18 km/h.

    Low: 0 °C

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 8. Northeast wind 8 to 13 km/h becoming southeast 16 to 21 km/h in the afternoon.

    High: 8 °C

    Mostly Cloudy

  • Sunday Night

    Sunday Night: A 50 percent chance of rain after 2am. Cloudy, with a low around 4.

    Low: 4 °C

    Mostly Cloudy
    then Chance
    Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 8am. High near 13. Breezy. Chance of precipitation is 90%.

    High: 13 °C

    Rain and
    Breezy

  • Monday Night

    Monday Night: Rain. Low around 3. Windy. Chance of precipitation is 90%.

    Low: 3 °C

    Rain and
    Windy

  • Tuesday

    Tuesday: Rain likely before 8am. Mostly sunny, with a high near 8. Chance of precipitation is 60%.

    High: 8 °C

    Rain Likely
    then Mostly
    Sunny

Detailed Forecast

This Afternoon
Mostly cloudy, with a high near 8. South wind 21 to 23 km/h.
Tonight
A 20 percent chance of rain before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 3. South wind 24 to 29 km/h, with gusts as high as 45 km/h.
Saturday
Sunny, with a high near 9. Breezy, with a west wind 26 to 31 km/h increasing to 35 to 40 km/h in the afternoon.
Saturday Night
Increasing clouds, with a low around 0. Northwest wind 8 to 18 km/h.
Sunday
Mostly cloudy, with a high near 8. Northeast wind 8 to 13 km/h becoming southeast 16 to 21 km/h in the afternoon.
Sunday Night
A 50 percent chance of rain after 2am. Cloudy, with a low around 4.
Monday
Rain, with thunderstorms also possible after 8am. High near 13. Breezy. Chance of precipitation is 90%.
Monday Night
Rain. Low around 3. Windy. Chance of precipitation is 90%.
Tuesday
Rain likely before 8am. Mostly sunny, with a high near 8. Chance of precipitation is 60%.
Tuesday Night
Partly cloudy, with a low around -4.
Wednesday
Sunny, with a high near 4.
Wednesday Night
Mostly cloudy, with a low around -2.
Thursday
Partly sunny, with a high near 6.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.78°N 73.09°W (Elev. 49 m)
Last Update:
6:18 am EDT Mar 13, 2026
Forecast Valid:
1pm EDT Mar 13, 2026-6pm EDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation