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

82°F

28°C

Humidity 33%
Wind Speed NW 9 mph
Barometer 29.93 in (1013.5 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 24 Jun 5:56 pm EDT
Extended Forecast for

Islip Terrace NY

  • Tonight

    Tonight: Mostly clear, with a low around 64. West wind 6 to 11 mph becoming light and variable in the evening.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Light and variable wind becoming south 6 to 11 mph in the afternoon.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 50 percent chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 67. South wind around 9 mph.

    Low: 67 °F

    Partly Cloudy
    then Chance
    Showers

  • Friday

    Friday: A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm. Mostly cloudy, with a high near 82. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.

    High: 82 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Chance
    Showers then
    Showers
    Likely

  • Saturday

    Saturday: Showers likely, mainly before 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 64.

    Low: 64 °F

    Chance
    Showers then
    Mostly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

Detailed Forecast

Tonight
Mostly clear, with a low around 64. West wind 6 to 11 mph becoming light and variable in the evening.
Thursday
Mostly sunny, with a high near 79. Light and variable wind becoming south 6 to 11 mph in the afternoon.
Thursday Night
A 50 percent chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 67. South wind around 9 mph.
Friday
A chance of showers and thunderstorms before 8am, then a slight chance of showers between 8am and 2pm. Mostly cloudy, with a high near 82. Southwest wind 6 to 9 mph. Chance of precipitation is 30%.
Friday Night
A chance of showers and thunderstorms, then showers likely after 11pm. Mostly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday
Showers likely, mainly before 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Saturday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 65.
Monday
Mostly sunny, with a high near 82.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
Mostly sunny, with a high near 83.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
2:41 pm EDT Jun 24, 2026
Forecast Valid:
6pm EDT Jun 24, 2026-6pm EDT Jul 1, 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