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

46°F

8°C

Humidity 71%
Wind Speed SE 12 mph
Barometer 30.40 in (1029.4 mb)
Dewpoint 37°F (3°C)
Visibility 10.00 mi
Wind Chill40°F (4°C)
Last update 12 Apr 6:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: Mostly cloudy, with a temperature rising to around 50 by 5am. South wind 3 to 8 mph.

    Low: 47 °F⇑

    Mostly Cloudy

  • Monday

    Monday: Mostly cloudy, with a high near 66. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.

    High: 66 °F

    Mostly Cloudy

  • Monday Night

    Monday Night: Partly cloudy, with a low around 53. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.

    Low: 53 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 72. South wind 5 to 9 mph.

    High: 72 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers before 2am. Partly cloudy, with a low around 55. Southwest wind 5 to 7 mph.

    Low: 55 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.

    Low: 55 °F

    Chance
    Showers

  • Thursday

    Thursday: Partly sunny, with a high near 70.

    High: 70 °F

    Partly Sunny

  • Thursday Night

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

    Low: 54 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Mostly cloudy, with a temperature rising to around 50 by 5am. South wind 3 to 8 mph.
Monday
Mostly cloudy, with a high near 66. Southwest wind 10 to 14 mph, with gusts as high as 24 mph.
Monday Night
Partly cloudy, with a low around 53. Southwest wind 6 to 9 mph, with gusts as high as 20 mph.
Tuesday
Mostly sunny, with a high near 72. South wind 5 to 9 mph.
Tuesday Night
A 20 percent chance of showers before 2am. Partly cloudy, with a low around 55. Southwest wind 5 to 7 mph.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 55.
Thursday
Partly sunny, with a high near 70.
Thursday Night
Mostly cloudy, with a low around 54.
Friday
Mostly sunny, with a high near 71.
Friday Night
Partly cloudy, with a low around 52.
Saturday
Mostly sunny, with a high near 66.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 49.
Sunday
Mostly cloudy, with a high near 64.
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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:
7:02 pm EDT Apr 12, 2026
Forecast Valid:
7pm EDT Apr 12, 2026-6pm EDT Apr 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation