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.

Overcast

50°F

10°C

Humidity 50%
Wind Speed W 13 G 25 mph
Barometer 29.82 in (1009.8 mb)
Dewpoint 32°F (0°C)
Visibility 10.00 mi
Wind Chill45°F (7°C)
Last update 13 Nov 12:56 pm EST
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • This Afternoon

    This Afternoon: A 20 percent chance of showers before 4pm. Partly sunny, with a high near 52. West wind 14 to 16 mph, with gusts as high as 29 mph.

    High: 52 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 36. Northwest wind 9 to 13 mph, with gusts as high as 26 mph.

    Low: 36 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 49. Northwest wind 9 to 14 mph.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 31. Northwest wind 6 to 8 mph.

    Low: 31 °F

    Partly Cloudy

  • Saturday

    Saturday: Increasing clouds, with a high near 55. Northwest wind 6 to 9 mph becoming southwest in the afternoon.

    High: 55 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: Rain. Temperature rising to around 49 by 3am. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 46 °F⇑

    Rain

  • Sunday

    Sunday: A 40 percent chance of rain before 1pm. Partly sunny, with a high near 59.

    High: 59 °F

    Chance Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 36.

    Low: 36 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 48.

    High: 48 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 20 percent chance of showers before 4pm. Partly sunny, with a high near 52. West wind 14 to 16 mph, with gusts as high as 29 mph.
Tonight
Mostly clear, with a low around 36. Northwest wind 9 to 13 mph, with gusts as high as 26 mph.
Friday
Mostly sunny, with a high near 49. Northwest wind 9 to 14 mph.
Friday Night
Partly cloudy, with a low around 31. Northwest wind 6 to 8 mph.
Saturday
Increasing clouds, with a high near 55. Northwest wind 6 to 9 mph becoming southwest in the afternoon.
Saturday Night
Rain. Temperature rising to around 49 by 3am. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
A 40 percent chance of rain before 1pm. Partly sunny, with a high near 59.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Mostly sunny, with a high near 48.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly sunny, with a high near 48.
Tuesday Night
Partly cloudy, with a low around 35.
Wednesday
Mostly sunny, with a high near 50.
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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:
1:01 pm EST Nov 13, 2025
Forecast Valid:
1pm EST Nov 13, 2025-6pm EST Nov 19, 2025
 
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