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.

Overcast

60°F

16°C

Humidity 90%
Wind Speed N 13 G 22 mph
Barometer 30.05 in (1017.5 mb)
Dewpoint 57°F (14°C)
Visibility 10.00 mi
Last update 21 Sep 8:56 am EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Today

    Today: Partly sunny, with a high near 70. North wind 13 to 16 mph.

    High: 70 °F

    Partly Sunny

  • Tonight

    Tonight: Mostly cloudy, with a low around 56. Northeast wind 9 to 11 mph.

    Low: 56 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: A 30 percent chance of rain, mainly between 8am and 11am. Mostly cloudy, with a high near 66. Northeast wind 14 to 17 mph.

    High: 66 °F

    Chance Rain

  • Tuesday Night

    Tuesday Night: Increasing clouds, with a low around 53. Northeast wind 13 to 15 mph.

    Low: 53 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Mostly cloudy, with a high near 66. Breezy, with a northeast wind 18 to 20 mph, with gusts as high as 33 mph.

    High: 66 °F

    Mostly Cloudy
    and Breezy

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 53.

    Low: 53 °F

    Mostly Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 66.

    High: 66 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 51.

    Low: 51 °F

    Mostly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A 50 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.

    High: 65 °F

    Chance
    Showers and
    Breezy

Detailed Forecast

Today
Partly sunny, with a high near 70. North wind 13 to 16 mph.
Tonight
Mostly cloudy, with a low around 56. Northeast wind 9 to 11 mph.
Tuesday
A 30 percent chance of rain, mainly between 8am and 11am. Mostly cloudy, with a high near 66. Northeast wind 14 to 17 mph.
Tuesday Night
Increasing clouds, with a low around 53. Northeast wind 13 to 15 mph.
Wednesday
Mostly cloudy, with a high near 66. Breezy, with a northeast wind 18 to 20 mph, with gusts as high as 33 mph.
Wednesday Night
Mostly cloudy, with a low around 53.
Thursday
Mostly cloudy, with a high near 66.
Thursday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 51.
Friday
A 50 percent chance of showers. Mostly cloudy, with a high near 65. Breezy.
Friday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 53. Breezy.
Saturday
A 50 percent chance of showers. Mostly cloudy, with a high near 66. Breezy.
Saturday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 54.
Sunday
Partly sunny, with a high near 68.
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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 ft)
Last Update:
3:38 am EDT Sep 21, 2026
Forecast Valid:
9am EDT Sep 21, 2026-6pm EDT Sep 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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