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

39°F

4°C

Humidity 43%
Wind Speed S 9 mph
Barometer 30.34 in (1027.6 mb)
Dewpoint 18°F (-8°C)
Visibility 10.00 mi
Wind Chill33°F (1°C)
Last update 24 Mar 6:56 pm EDT
Extended Forecast for

Islip NY

  • Tonight

    Tonight: Increasing clouds, with a low around 31. Southwest wind 6 to 9 mph.

    Low: 31 °F

    Increasing
    Clouds

  • Wednesday

    Wednesday: Partly sunny, with a high near 49. South wind 5 to 9 mph.

    High: 49 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: Cloudy, with a low around 39. South wind around 7 mph.

    Low: 39 °F

    Cloudy

  • Thursday

    Thursday: Mostly cloudy, with a high near 58. Southwest wind 8 to 14 mph.

    High: 58 °F

    Mostly Cloudy

  • Thursday Night

    Thursday Night: Rain, mainly after 2am. Low around 46. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 46 °F

    Slight Chance
    Rain then
    Rain

  • Friday

    Friday: Rain likely, mainly before 8am. Mostly cloudy, with a high near 56. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 56 °F

    Rain Likely
    then Mostly
    Cloudy

  • Friday Night

    Friday Night: Partly cloudy, with a low around 28.

    Low: 28 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 43.

    High: 43 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 31.

    Low: 31 °F

    Partly Cloudy

Detailed Forecast

Tonight
Increasing clouds, with a low around 31. Southwest wind 6 to 9 mph.
Wednesday
Partly sunny, with a high near 49. South wind 5 to 9 mph.
Wednesday Night
Cloudy, with a low around 39. South wind around 7 mph.
Thursday
Mostly cloudy, with a high near 58. Southwest wind 8 to 14 mph.
Thursday Night
Rain, mainly after 2am. Low around 46. Southwest wind 10 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Friday
Rain likely, mainly before 8am. Mostly cloudy, with a high near 56. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Partly cloudy, with a low around 28.
Saturday
Sunny, with a high near 43.
Saturday Night
Partly cloudy, with a low around 31.
Sunday
Sunny, with a high near 47.
Sunday Night
Partly cloudy, with a low around 36.
Monday
Partly sunny, with a high near 52.
Monday Night
Partly cloudy, with a low around 38.
Tuesday
Partly sunny, with a high near 53.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip NY
 40.73°N 73.22°W (Elev. 7 ft)
Last Update:
7:09 pm EDT Mar 24, 2026
Forecast Valid:
7pm EDT Mar 24, 2026-6pm EDT Mar 31, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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