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

86°F

30°C

Humidity 65%
Wind Speed NW 10 mph
Barometer 29.96 in (1014.3 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index93°F (34°C)
Last update 9 Aug 10:56 am EDT
Extended Forecast for

Fort Salonga NY

Heat Advisory until August 9, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until August 9, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Today

    High: 91 °F

    Slight Chance
    T-storms

  • Tonight

    Tonight: Clear, with a low around 72. Northwest wind around 5 mph becoming light and variable after midnight.

    Low: 72 °F

    Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 91. Heat index values as high as 100. Calm wind becoming southwest 5 to 9 mph in the afternoon.

    High: 91 °F

    Sunny then
    Chance
    Showers

  • Monday Night

    Monday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 73. Southwest wind around 9 mph. Chance of precipitation is 30%.

    Low: 73 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. West wind around 8 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 69.

    Low: 69 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A chance of showers between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 50%.

    Low: 70 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
A 20 percent chance of showers and thunderstorms after noon. Sunny, with a high near 91. Heat index values as high as 100. West wind around 7 mph.
Tonight
Clear, with a low around 72. Northwest wind around 5 mph becoming light and variable after midnight.
Monday
A 30 percent chance of showers and thunderstorms after 2pm. Increasing clouds, with a high near 91. Heat index values as high as 100. Calm wind becoming southwest 5 to 9 mph in the afternoon.
Monday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 73. Southwest wind around 9 mph. Chance of precipitation is 30%.
Tuesday
Mostly sunny, with a high near 89. West wind around 8 mph.
Tuesday Night
Mostly cloudy, with a low around 69.
Wednesday
Mostly sunny, with a high near 86.
Wednesday Night
A chance of showers between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 50%.
Thursday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm. Partly sunny, with a high near 86. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 68.
Friday
Mostly sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 64.
Saturday
Sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fort Salonga NY
 40.92°N 73.3°W (Elev. 26 ft)
Last Update:
2:58 am EDT Aug 9, 2026
Forecast Valid:
11am EDT Aug 9, 2026-6pm EDT Aug 15, 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