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.

Mostly Cloudy

74°F

23°C

Humidity 91%
Wind Speed SW 6 mph
Barometer 29.98 in (1014.9 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Last update 17 Aug 5:56 am EDT
Extended Forecast for

Selden NY

  • Today

    Today: Mostly sunny, with a high near 87. Southwest wind 6 to 11 mph.

    High: 87 °F

    Mostly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southwest wind 5 to 15 mph becoming north after midnight. Chance of precipitation is 40%.

    Low: 64 °F

    Chance
    Showers

  • Monday

    Monday: A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 75. Northeast wind 14 to 18 mph, with gusts as high as 28 mph.

    High: 75 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 60. East wind around 8 mph.

    Low: 60 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 77. Northeast wind around 11 mph.

    High: 77 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Mostly Cloudy
    then Chance
    Showers

  • Wednesday

    Wednesday: A 30 percent chance of showers. Partly sunny, with a high near 78.

    High: 78 °F

    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

Detailed Forecast

Today
Mostly sunny, with a high near 87. Southwest wind 6 to 11 mph.
Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 64. Southwest wind 5 to 15 mph becoming north after midnight. Chance of precipitation is 40%.
Monday
A 20 percent chance of showers before 2pm. Mostly cloudy, with a high near 75. Northeast wind 14 to 18 mph, with gusts as high as 28 mph.
Monday Night
Mostly cloudy, with a low around 60. East wind around 8 mph.
Tuesday
Mostly sunny, with a high near 77. Northeast wind around 11 mph.
Tuesday Night
A 30 percent chance of showers after 2am. Mostly cloudy, with a low around 63.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 78.
Wednesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 63.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Sunny, with a high near 84.
Friday Night
Mostly clear, with a low around 66.
Saturday
Sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Selden NY
 40.86°N 73.04°W (Elev. 115 ft)
Last Update:
2:49 am EDT Aug 17, 2025
Forecast Valid:
6am EDT Aug 17, 2025-6pm EDT Aug 23, 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