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 64%
Wind Speed SW 13 mph
Barometer 30.31 in (1026.3 mb)
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 16 Sep 2:56 pm EDT
Extended Forecast for

Selden NY

  • Tonight

    Tonight: Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 64. South wind 5 to 7 mph becoming calm in the evening.

    Low: 64 °F

    Patchy Fog

  • Thursday

    Thursday: Mostly sunny, with a high near 79. Calm wind becoming south 5 to 9 mph in the morning.

    High: 79 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A 30 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 66. Southwest wind around 9 mph.

    Low: 66 °F

    Chance
    Showers

  • Friday

    Friday: Partly sunny through mid morning, then becoming sunny, with a high near 78. North wind 8 to 10 mph.

    High: 78 °F

    Becoming
    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 56. Northeast wind 8 to 10 mph.

    Low: 56 °F

    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 68.

    High: 68 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly cloudy, with a low around 56.

    Low: 56 °F

    Mostly Cloudy

  • Sunday

    Sunday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

    High: 71 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Showers likely, mainly before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.

    Low: 57 °F

    Showers
    Likely

Detailed Forecast

Tonight
Patchy fog after 8pm. Otherwise, partly cloudy, with a low around 64. South wind 5 to 7 mph becoming calm in the evening.
Thursday
Mostly sunny, with a high near 79. Calm wind becoming south 5 to 9 mph in the morning.
Thursday Night
A 30 percent chance of showers, mainly before 5am. Mostly cloudy, with a low around 66. Southwest wind around 9 mph.
Friday
Partly sunny through mid morning, then becoming sunny, with a high near 78. North wind 8 to 10 mph.
Friday Night
Partly cloudy, with a low around 56. Northeast wind 8 to 10 mph.
Saturday
Mostly sunny, with a high near 68.
Saturday Night
Mostly cloudy, with a low around 56.
Sunday
Showers likely, mainly after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.
Sunday Night
Showers likely, mainly before 2am. Mostly cloudy, with a low around 57. Chance of precipitation is 60%.
Monday
A 30 percent chance of showers. Mostly cloudy, with a high near 70.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 56.
Tuesday
A 30 percent chance of showers. Mostly cloudy, with a high near 68.
Tuesday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 56.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 68.
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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:
3:19 pm EDT Sep 16, 2026
Forecast Valid:
3pm EDT Sep 16, 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