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.

Mostly Cloudy

76°F

24°C

Humidity 60%
Wind Speed N 10 mph
Barometer 29.91 in (1012.8 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 22 Jul 10:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Partly cloudy, with a low around 64. North wind around 6 mph.

    Low: 64 °F

    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 81. North wind around 7 mph.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 63. Light and variable wind.

    Low: 63 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 82. Calm wind becoming east 5 to 8 mph in the morning.

    High: 82 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 82.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 80.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 64. North wind around 6 mph.
Thursday
Sunny, with a high near 81. North wind around 7 mph.
Thursday Night
Clear, with a low around 63. Light and variable wind.
Friday
Sunny, with a high near 82. Calm wind becoming east 5 to 8 mph in the morning.
Friday Night
Mostly clear, with a low around 64. Southeast wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 80.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 82.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68.
Tuesday
A 40 percent chance of showers. Partly sunny, with a high near 82.
Tuesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 83.
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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:
6:54 pm EDT Jul 22, 2026
Forecast Valid:
11pm EDT Jul 22, 2026-6pm EDT Jul 29, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation