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.

Partly Cloudy

89°F

32°C

Humidity 43%
Wind Speed NW 10 mph
Barometer 29.94 in (1013.7 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Heat Index90°F (32°C)
Last update 9 Aug 4:56 pm EDT
Extended Forecast for

Selden NY

Heat Advisory August 9, 05:25pm until August 10, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 9, 05:25pm until August 10, 07:00pm

    NOW until 7:00pm Mon

    Heat Advisory

  • Tonight

    Low: 70 °F

    Mostly Clear

  • Monday

    Monday: A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny, with a high near 89. Heat index values as high as 95. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 89 °F

    Sunny then
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. West wind around 7 mph.

    Low: 73 °F

    Chance
    T-storms then
    Mostly Clear

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88. West wind 7 to 9 mph.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 68. Northwest wind 3 to 6 mph.

    Low: 68 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 85.

    High: 85 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 40 percent chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 70.

    Low: 70 °F

    Partly Cloudy
    then Chance
    T-storms

  • Thursday

    Thursday: A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 30%.

    High: 86 °F

    Chance
    T-storms then
    Chance
    Showers

Detailed Forecast

Tonight
Mostly clear, with a low around 70. West wind 5 to 7 mph becoming calm in the evening.
Monday
A 30 percent chance of showers and thunderstorms, mainly after 5pm. Sunny, with a high near 89. Heat index values as high as 95. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
A 30 percent chance of showers and thunderstorms before 11pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 73. West wind around 7 mph.
Tuesday
Mostly sunny, with a high near 88. West wind 7 to 9 mph.
Tuesday Night
Partly cloudy, with a low around 68. Northwest wind 3 to 6 mph.
Wednesday
Mostly sunny, with a high near 85.
Wednesday Night
A 40 percent chance of showers and thunderstorms after 2am. Partly cloudy, with a low around 70.
Thursday
A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm. Mostly sunny, with a high near 86. Chance of precipitation is 30%.
Thursday Night
Partly cloudy, with a low around 65.
Friday
Sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 63.
Saturday
Sunny, with a high near 81.
Saturday Night
Partly cloudy, with a low around 63.
Sunday
Mostly sunny, with a high near 80.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Selden NY
 40.87°N 73.07°W (Elev. 98 ft)
Last Update:
2:26 pm EDT Aug 9, 2026
Forecast Valid:
5pm EDT Aug 9, 2026-6pm EDT Aug 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