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.

Mostly Cloudy

75°F

24°C

Humidity 71%
Wind Speed S 10 mph
Barometer 30.08 in (1018.5 mb)
Dewpoint 65°F (18°C)
Visibility 10.00 mi
Last update 21 Jun 10:56 pm EDT
Extended Forecast for

Nesconset NY

Extreme Heat Watch June 23, 12:00pm until June 24, 08:00pm
Heat Advisory June 22, 12:00pm until June 22, 08:00pm
Click here for hazard details and duration
Extreme Heat Watch
Heat Advisory

  • Tonight

    Tonight: Partly cloudy, with a low around 70. Southwest wind around 6 mph.

    Low: 70 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny, with a high near 92. Heat index values as high as 96. Southwest wind 9 to 14 mph.

    High: 92 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 74. West wind 6 to 8 mph.

    Low: 74 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 94. Heat index values as high as 100. Northwest wind 5 to 7 mph becoming southwest in the afternoon.

    High: 94 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 72. Southwest wind around 6 mph becoming calm after midnight.

    Low: 72 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 74.

    Low: 74 °F

    Mostly Clear

  • Wednesday

    Wednesday: Mostly sunny, with a high near 90.

    High: 90 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Partly cloudy, with a low around 70. Southwest wind around 6 mph.
Sunday
Mostly sunny, with a high near 92. Heat index values as high as 96. Southwest wind 9 to 14 mph.
Sunday Night
Mostly clear, with a low around 74. West wind 6 to 8 mph.
Monday
Sunny, with a high near 94. Heat index values as high as 100. Northwest wind 5 to 7 mph becoming southwest in the afternoon.
Monday Night
Mostly clear, with a low around 72. Southwest wind around 6 mph becoming calm after midnight.
Tuesday
Sunny, with a high near 96.
Tuesday Night
Mostly clear, with a low around 74.
Wednesday
Mostly sunny, with a high near 90.
Wednesday Night
Mostly cloudy, with a low around 67.
Thursday
Partly sunny, with a high near 81.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 65.
Friday
A 30 percent chance of showers. Mostly cloudy, with a high near 77.
Friday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 65.
Saturday
A 30 percent chance of showers. Partly sunny, with a high near 79.
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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:
6:40 pm EDT Jun 21, 2025
Forecast Valid:
11pm EDT Jun 21, 2025-6pm EDT Jun 28, 2025
 
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