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.

Partly Cloudy

39°F

4°C

Humidity 73%
Wind Speed S 16 mph
Barometer 29.86 in (1011.1 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill30°F (-1°C)
Last update 13 Mar 9:56 pm EDT
Extended Forecast for

Islip, Long Island Mac Arthur Airport NY

  • Tonight

    Tonight: A slight chance of showers between 11pm and 2am. Partly cloudy, with a steady temperature around 41. Southwest wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.

    Low: 41 °F

    Slight Chance
    Showers

  • Saturday

    Saturday: Sunny, with a high near 49. Breezy, with a west wind 16 to 21 mph, with gusts as high as 38 mph.

    High: 49 °F

    Sunny and
    Breezy

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 32. Northwest wind 6 to 11 mph becoming light after midnight.

    Low: 32 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Mostly cloudy, with a high near 48. Light and variable wind becoming southeast 5 to 10 mph in the morning.

    High: 48 °F

    Mostly Cloudy

  • Sunday Night

    Sunday Night: Rain after 2am. Low around 39. Southeast wind 10 to 16 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

    Low: 39 °F

    Mostly Cloudy
    then Rain

  • Monday

    Monday: Rain, with thunderstorms also possible after 2pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    High: 56 °F

    Rain

  • Monday Night

    Monday Night: Rain and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 90%.

    Low: 35 °F

    Rain and
    Breezy

  • Tuesday

    Tuesday: A 30 percent chance of rain before 8am. Mostly sunny, with a high near 44.

    High: 44 °F

    Chance Rain
    then Mostly
    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 24.

    Low: 24 °F

    Partly Cloudy

Detailed Forecast

Tonight
A slight chance of showers between 11pm and 2am. Partly cloudy, with a steady temperature around 41. Southwest wind 14 to 17 mph, with gusts as high as 29 mph. Chance of precipitation is 20%.
Saturday
Sunny, with a high near 49. Breezy, with a west wind 16 to 21 mph, with gusts as high as 38 mph.
Saturday Night
Increasing clouds, with a low around 32. Northwest wind 6 to 11 mph becoming light after midnight.
Sunday
Mostly cloudy, with a high near 48. Light and variable wind becoming southeast 5 to 10 mph in the morning.
Sunday Night
Rain after 2am. Low around 39. Southeast wind 10 to 16 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Monday
Rain, with thunderstorms also possible after 2pm. High near 56. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Monday Night
Rain and possibly a thunderstorm. Low around 35. Breezy. Chance of precipitation is 90%.
Tuesday
A 30 percent chance of rain before 8am. Mostly sunny, with a high near 44.
Tuesday Night
Partly cloudy, with a low around 24.
Wednesday
Mostly sunny, with a high near 38.
Wednesday Night
Mostly cloudy, with a low around 29.
Thursday
Partly sunny, with a high near 44.
Thursday Night
Partly cloudy, with a low around 33.
Friday
Partly sunny, with a high near 46.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip, Long Island Mac Arthur Airport NY
 40.8°N 73.09°W (Elev. 98 ft)
Last Update:
9:14 pm EDT Mar 13, 2026
Forecast Valid:
10pm EDT Mar 13, 2026-6pm EDT Mar 20, 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