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.

Fair

69°F

21°C

Humidity 93%
Wind Speed Calm
Barometer 30.25 in (1024.3 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 17 Sep 3:56 am EDT
Extended Forecast for

Selden NY

  • Today

    Today: Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming south 5 to 9 mph in the morning.

    High: 78 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Tonight

    Tonight: A 40 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 66. South wind around 8 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 78. North wind 7 to 11 mph.

    High: 78 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. Northeast wind around 9 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68. Northeast wind 6 to 9 mph.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 56.

    Low: 56 °F

    Increasing
    Clouds

  • Sunday

    Sunday: Showers. High near 70. Chance of precipitation is 80%.

    High: 70 °F

    Showers

  • Sunday Night

    Sunday Night: Showers, mainly before 2am. Low around 56. Chance of precipitation is 80%.

    Low: 56 °F

    Showers

  • Monday

    Monday: A 30 percent chance of showers before 8am. Partly sunny, with a high near 68.

    High: 68 °F

    Chance
    Showers then
    Partly Sunny

Detailed Forecast

Today
Patchy fog before 8am. Otherwise, mostly cloudy, with a high near 78. Calm wind becoming south 5 to 9 mph in the morning.
Tonight
A 40 percent chance of showers, mainly between 11pm and 5am. Mostly cloudy, with a low around 66. South wind around 8 mph.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 78. North wind 7 to 11 mph.
Friday Night
Partly cloudy, with a low around 56. Northeast wind around 9 mph.
Saturday
Mostly sunny, with a high near 68. Northeast wind 6 to 9 mph.
Saturday Night
Increasing clouds, with a low around 56.
Sunday
Showers. High near 70. Chance of precipitation is 80%.
Sunday Night
Showers, mainly before 2am. Low around 56. Chance of precipitation is 80%.
Monday
A 30 percent chance of showers before 8am. Partly sunny, with a high near 68.
Monday Night
Mostly cloudy, with a low around 55.
Tuesday
Partly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 54.
Wednesday
Mostly sunny, with a high near 67.
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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:
1:55 am EDT Sep 17, 2026
Forecast Valid:
4am EDT Sep 17, 2026-6pm EDT Sep 23, 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