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.

Mostly Cloudy

66°F

19°C

Humidity 52%
Wind Speed NE 7 mph
Barometer 30.22 in (1023.2 mb)
Dewpoint 48°F (9°C)
Visibility 10.00 mi
Last update 4 Apr 11:56 am EDT
Extended Forecast for

Islip NY

  • This Afternoon

    This Afternoon: Partly sunny, with a temperature falling to around 49 by 5pm. East wind 9 to 15 mph.

    High: 71 °F⇓

    Partly Sunny

  • Tonight

    Tonight: A chance of rain between 11pm and 5am, then a chance of rain and thunderstorms after 5am. Cloudy, with a low around 41. East wind 7 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.

    Low: 41 °F

    Chance Rain

  • Sunday

    Sunday: Rain and thunderstorms likely, then rain after 2pm. High near 57. Southwest wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 57 °F

    Rain Likely
    then Rain

  • Sunday Night

    Sunday Night: Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 7 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 39 °F

    Rain Likely
    then Partly
    Cloudy

  • Monday

    Monday: Sunny, with a high near 53. West wind around 10 mph.

    High: 53 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 39.

    Low: 39 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 50.

    High: 50 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 30.

    Low: 30 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 45.

    High: 45 °F

    Sunny

Detailed Forecast

This Afternoon
Partly sunny, with a temperature falling to around 49 by 5pm. East wind 9 to 15 mph.
Tonight
A chance of rain between 11pm and 5am, then a chance of rain and thunderstorms after 5am. Cloudy, with a low around 41. East wind 7 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 40%.
Sunday
Rain and thunderstorms likely, then rain after 2pm. High near 57. Southwest wind 11 to 16 mph, with gusts as high as 29 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
Rain likely before 8pm. Cloudy during the early evening, then gradual clearing, with a low around 39. Northwest wind 7 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Monday
Sunny, with a high near 53. West wind around 10 mph.
Monday Night
Partly cloudy, with a low around 39.
Tuesday
Mostly sunny, with a high near 50.
Tuesday Night
Mostly clear, with a low around 30.
Wednesday
Sunny, with a high near 45.
Wednesday Night
Mostly clear, with a low around 35.
Thursday
Sunny, with a high near 53.
Thursday Night
Partly cloudy, with a low around 42.
Friday
Mostly sunny, with a high near 58.
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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:
10:06 am EDT Apr 4, 2026
Forecast Valid:
12pm EDT Apr 4, 2026-6pm EDT Apr 10, 2026
 
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