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

51°F

11°C

Humidity 43%
Wind Speed W 16 G 28 mph
Barometer 29.82 in (1009.9 mb)
Dewpoint 29°F (-2°C)
Visibility 10.00 mi
Wind Chill46°F (8°C)
Last update 13 Nov 11:56 am EST
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: A 30 percent chance of showers before 1pm. Partly sunny, with a high near 52. West wind around 16 mph, with gusts as high as 30 mph.

    High: 52 °F

    Chance
    Showers

  • Tonight

    Tonight: Mostly clear, with a low around 37. Northwest wind 10 to 14 mph, with gusts as high as 28 mph.

    Low: 37 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 49. Northwest wind 10 to 14 mph.

    High: 49 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 32. Northwest wind 7 to 10 mph.

    Low: 32 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 53. Northwest wind 6 to 9 mph becoming southwest in the afternoon.

    High: 53 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers. Temperature rising to around 50 by 3am. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 47 °F⇑

    Showers

  • Sunday

    Sunday: A 50 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 59.

    High: 59 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 37.

    Low: 37 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 49.

    High: 49 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
A 30 percent chance of showers before 1pm. Partly sunny, with a high near 52. West wind around 16 mph, with gusts as high as 30 mph.
Tonight
Mostly clear, with a low around 37. Northwest wind 10 to 14 mph, with gusts as high as 28 mph.
Friday
Mostly sunny, with a high near 49. Northwest wind 10 to 14 mph.
Friday Night
Mostly clear, with a low around 32. Northwest wind 7 to 10 mph.
Saturday
Mostly sunny, with a high near 53. Northwest wind 6 to 9 mph becoming southwest in the afternoon.
Saturday Night
Showers. Temperature rising to around 50 by 3am. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday
A 50 percent chance of showers before 1pm. Cloudy, then gradually becoming mostly sunny, with a high near 59.
Sunday Night
Mostly clear, with a low around 37.
Monday
Mostly sunny, with a high near 49.
Monday Night
Partly cloudy, with a low around 35.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly cloudy, with a low around 36.
Wednesday
Mostly sunny, with a high near 50.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
11:02 am EST Nov 13, 2025
Forecast Valid:
12pm EST Nov 13, 2025-6pm EST Nov 19, 2025
 
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