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

42°F

6°C

Humidity 41%
Wind Speed NW 12 G 18 mph
Barometer 30.40 in (1029.3 mb)
Dewpoint 20°F (-7°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 29 Nov 9:56 am EST
Extended Forecast for

Islip NY

  • Today

    Today: Sunny, with a high near 43. Northwest wind 7 to 11 mph.

    High: 43 °F

    Sunny

  • Tonight

    Tonight: Increasing clouds, with a low around 32. Calm wind becoming south around 6 mph after midnight.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Rain, mainly after 1pm. High near 53. South wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 53 °F

    Chance Rain
    then Rain

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34. Southwest wind 11 to 15 mph, with gusts as high as 26 mph.

    Low: 34 °F

    Chance Rain

  • Monday

    Monday: Sunny, with a high near 42. Northwest wind 10 to 14 mph.

    High: 42 °F

    Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 29.

    Low: 29 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Rain, mainly after 1pm. High near 48. Chance of precipitation is 90%.

    High: 48 °F

    Chance Rain
    then Rain

  • Tuesday Night

    Tuesday Night: Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 70%.

    Low: 31 °F

    Rain Likely

  • Wednesday

    Wednesday: Mostly sunny, with a high near 42.

    High: 42 °F

    Mostly Sunny

Detailed Forecast

Today
Sunny, with a high near 43. Northwest wind 7 to 11 mph.
Tonight
Increasing clouds, with a low around 32. Calm wind becoming south around 6 mph after midnight.
Sunday
Rain, mainly after 1pm. High near 53. South wind 9 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Sunday Night
A 40 percent chance of rain before 1am. Cloudy, then gradually becoming partly cloudy, with a low around 34. Southwest wind 11 to 15 mph, with gusts as high as 26 mph.
Monday
Sunny, with a high near 42. Northwest wind 10 to 14 mph.
Monday Night
Increasing clouds, with a low around 29.
Tuesday
Rain, mainly after 1pm. High near 48. Chance of precipitation is 90%.
Tuesday Night
Rain likely, mainly before 1am. Mostly cloudy, with a low around 31. Chance of precipitation is 70%.
Wednesday
Mostly sunny, with a high near 42.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Partly sunny, with a high near 42.
Thursday Night
Partly cloudy, with a low around 22.
Friday
Partly sunny, with a high near 39.
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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:
5:02 am EST Nov 29, 2025
Forecast Valid:
10am EST Nov 29, 2025-6pm EST Dec 5, 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