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.

A Few Clouds

77°F

25°C

Humidity 39%
Wind Speed NW 13 mph
Barometer 30.10 in (1019.2 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 7 Sep 2:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly clear, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.

    Low: 61 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 81. Northwest wind around 6 mph.

    High: 81 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm in the evening.

    Low: 65 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 80. Light southwest wind becoming south 8 to 13 mph in the morning.

    High: 80 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70. Southwest wind around 15 mph, with gusts as high as 28 mph.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.

    Low: 65 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 61.

    Low: 61 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 61. Northwest wind around 6 mph becoming calm in the evening.
Tuesday
Sunny, with a high near 81. Northwest wind around 6 mph.
Tuesday Night
Partly cloudy, with a low around 65. Southwest wind around 5 mph becoming calm in the evening.
Wednesday
Mostly sunny, with a high near 80. Light southwest wind becoming south 8 to 13 mph in the morning.
Wednesday Night
Partly cloudy, with a low around 70. Southwest wind around 15 mph, with gusts as high as 28 mph.
Thursday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 84.
Thursday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 65.
Friday
Mostly sunny, with a high near 77.
Friday Night
Mostly clear, with a low around 61.
Saturday
Mostly sunny, with a high near 76.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 78.
Sunday Night
Partly cloudy, with a low around 64.
Monday
Mostly sunny, with a high near 78.
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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:
2:19 pm EDT Sep 7, 2026
Forecast Valid:
3pm EDT Sep 7, 2026-6pm EDT Sep 14, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation