National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

47°F

8°C

Humidity 80%
Wind Speed W 8 mph
Barometer 30.07 in (1018.4 mb)
Dewpoint 41°F (5°C)
Visibility 10.00 mi
Wind Chill43°F (6°C)
Last update 11 Apr 4:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Sunny, with a high near 60. Breezy, with a northwest wind 9 to 14 mph increasing to 16 to 21 mph in the morning.

    High: 60 °F

    Sunny and
    Breezy

  • Tonight

    Tonight: Clear, with a low around 37. North wind 5 to 10 mph becoming light after midnight.

    Low: 37 °F

    Clear

  • Sunday

    Sunday: Increasing clouds, with a high near 54. Calm wind becoming south 5 to 7 mph in the afternoon.

    High: 54 °F

    Increasing
    Clouds

  • Sunday Night

    Sunday Night: Mostly cloudy, with a low around 44. South wind 6 to 8 mph.

    Low: 44 °F

    Mostly Cloudy

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 63 °F

    Partly Sunny
    then Slight
    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 52.

    Low: 52 °F

    Decreasing
    Clouds

  • Tuesday

    Tuesday: Partly sunny, with a high near 74.

    High: 74 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Partly sunny, with a high near 78.

    High: 78 °F

    Partly Sunny

Detailed Forecast

Today
Sunny, with a high near 60. Breezy, with a northwest wind 9 to 14 mph increasing to 16 to 21 mph in the morning.
Tonight
Clear, with a low around 37. North wind 5 to 10 mph becoming light after midnight.
Sunday
Increasing clouds, with a high near 54. Calm wind becoming south 5 to 7 mph in the afternoon.
Sunday Night
Mostly cloudy, with a low around 44. South wind 6 to 8 mph.
Monday
A 20 percent chance of showers after 2pm. Mostly cloudy, with a high near 63. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Monday Night
Mostly cloudy, then gradually becoming mostly clear, with a low around 52.
Tuesday
Partly sunny, with a high near 74.
Tuesday Night
Mostly cloudy, with a low around 54.
Wednesday
Partly sunny, with a high near 78.
Wednesday Night
Mostly cloudy, with a low around 58.
Thursday
Partly sunny, with a high near 76.
Thursday Night
Mostly cloudy, with a low around 53.
Friday
Mostly cloudy, with a high near 66.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
4:11 am EDT Apr 11, 2026
Forecast Valid:
5am EDT Apr 11, 2026-6pm EDT Apr 17, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation