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 88%
Wind Speed Calm
Barometer 30.02 in (1016.6 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 28 Aug 8:56 pm EDT
Extended Forecast for

Selden NY

  • Tonight

    Tonight: Partly cloudy, with a low around 60. Light northwest wind becoming north 5 to 9 mph after midnight.

    Low: 60 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 77. North wind 3 to 8 mph.

    High: 77 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 62. Light southwest wind.

    Low: 62 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 80. Light west wind becoming southwest 6 to 11 mph in the morning.

    High: 80 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 68. Southwest wind 6 to 9 mph. Chance of precipitation is 50%.

    Low: 68 °F

    Chance
    Showers

  • Monday

    Monday: Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 67.

    Low: 67 °F

    Mostly Cloudy
    then Chance
    Showers

  • Tuesday

    Tuesday: A 40 percent chance of showers. Mostly cloudy, with a high near 79.

    High: 79 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.

    Low: 68 °F

    Chance
    T-storms

Detailed Forecast

Tonight
Partly cloudy, with a low around 60. Light northwest wind becoming north 5 to 9 mph after midnight.
Saturday
Sunny, with a high near 77. North wind 3 to 8 mph.
Saturday Night
Mostly clear, with a low around 62. Light southwest wind.
Sunday
Mostly sunny, with a high near 80. Light west wind becoming southwest 6 to 11 mph in the morning.
Sunday Night
A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then a chance of showers after 2am. Mostly cloudy, with a low around 68. Southwest wind 6 to 9 mph. Chance of precipitation is 50%.
Monday
Partly sunny, with a high near 81.
Monday Night
A 40 percent chance of showers after 2am. Mostly cloudy, with a low around 67.
Tuesday
A 40 percent chance of showers. Mostly cloudy, with a high near 79.
Tuesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Wednesday
A 40 percent chance of showers. Mostly cloudy, with a high near 82.
Wednesday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Thursday
A 40 percent chance of showers. Partly sunny, with a high near 83.
Thursday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 66.
Friday
Mostly sunny, with a high near 79.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Selden NY
 40.86°N 73.04°W (Elev. 115 ft)
Last Update:
2:11 pm EDT Aug 28, 2026
Forecast Valid:
9pm EDT Aug 28, 2026-6pm EDT Sep 4, 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