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

81°F

27°C

Humidity 69%
Wind Speed Calm
Barometer 29.87 in (1011.3 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 13 Aug 6:56 pm EDT
Extended Forecast for

Selden NY

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 68. Northwest wind 3 to 5 mph.

    Low: 68 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 84. North wind 3 to 6 mph.

    High: 84 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 65. Calm wind becoming northeast around 5 mph after midnight.

    Low: 65 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 82. Northeast wind around 7 mph.

    High: 82 °F

    Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 65. Light southwest wind.

    Low: 65 °F

    Partly Cloudy

  • Sunday

    Sunday: A 50 percent chance of showers after 2pm. Partly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny
    then Chance
    Showers

  • Sunday Night

    Sunday Night: A chance of showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 68. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Monday

    Monday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 83.

    High: 83 °F

    Chance
    Showers then
    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 68. Northwest wind 3 to 5 mph.
Friday
Mostly sunny, with a high near 84. North wind 3 to 6 mph.
Friday Night
Partly cloudy, with a low around 65. Calm wind becoming northeast around 5 mph after midnight.
Saturday
Sunny, with a high near 82. Northeast wind around 7 mph.
Saturday Night
Partly cloudy, with a low around 65. Light southwest wind.
Sunday
A 50 percent chance of showers after 2pm. Partly sunny, with a high near 81.
Sunday Night
A chance of showers before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers after 2am. Low around 68. Chance of precipitation is 80%.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 83.
Monday Night
Partly cloudy, with a low around 65.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Sunny, with a high near 82.
Wednesday Night
Partly cloudy, with a low around 69.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 84.
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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:
2:19 pm EDT Aug 13, 2026
Forecast Valid:
7pm EDT Aug 13, 2026-6pm EDT Aug 20, 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