National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

73°F

23°C

Humidity 94%
Wind Speed SW 7 mph
Barometer 29.83 in (1009.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 9 Jul 10:56 pm EDT
Extended Forecast for

Nesconset NY

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Southwest wind 5 to 8 mph.

    Low: 71 °F

    Slight Chance
    T-storms

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Heat index values as high as 97. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.

    High: 90 °F

    Partly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. West wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Chance
    Showers

  • Saturday

    Saturday: A 20 percent chance of showers. Partly sunny, with a high near 84. Northeast wind 6 to 9 mph.

    High: 84 °F

    Slight Chance
    Showers

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68. East wind around 6 mph becoming calm in the evening.

    Low: 68 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 66.

    Low: 66 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 69.

    Low: 69 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Southwest wind 5 to 8 mph.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 90. Heat index values as high as 97. Northwest wind 7 to 10 mph, with gusts as high as 20 mph.
Friday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. West wind around 6 mph becoming light and variable in the evening. Chance of precipitation is 30%.
Saturday
A 20 percent chance of showers. Partly sunny, with a high near 84. Northeast wind 6 to 9 mph.
Saturday Night
Partly cloudy, with a low around 68. East wind around 6 mph becoming calm in the evening.
Sunday
Sunny, with a high near 84.
Sunday Night
Mostly clear, with a low around 66.
Monday
Sunny, with a high near 84.
Monday Night
Mostly clear, with a low around 69.
Tuesday
Sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 73.
Wednesday
Mostly sunny, with a high near 93.
Wednesday Night
Partly cloudy, with a low around 73.
Thursday
Mostly sunny, with a high near 91.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Nesconset NY
 40.86°N 73.16°W (Elev. 98 ft)
Last Update:
3:03 pm EDT Jul 9, 2026
Forecast Valid:
11pm EDT Jul 9, 2026-6pm EDT Jul 16, 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