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

43°F

6°C

Humidity 56%
Wind Speed N 8 mph
Barometer 30.44 in (1030.9 mb)
Dewpoint 28°F (-2°C)
Visibility 10.00 mi
Wind Chill38°F (3°C)
Last update 18 Oct 2:56 am EDT
Extended Forecast for

Selden NY

  • Overnight

    Overnight: Clear, with a steady temperature around 40. North wind around 8 mph.

    Low: 40 °F

    Clear

  • Sunday

    Sunday: Sunny, with a high near 56. North wind 6 to 8 mph.

    High: 56 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 43. Light east wind.

    Low: 43 °F

    Mostly Clear

  • Monday

    Monday: Increasing clouds, with a high near 59. Northeast wind 8 to 11 mph.

    High: 59 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 46. North wind 8 to 13 mph, with gusts as high as 23 mph.

    Low: 46 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 45.

    Low: 45 °F

    Partly Cloudy

Detailed Forecast

Overnight
Clear, with a steady temperature around 40. North wind around 8 mph.
Sunday
Sunny, with a high near 56. North wind 6 to 8 mph.
Sunday Night
Mostly clear, with a low around 43. Light east wind.
Monday
Increasing clouds, with a high near 59. Northeast wind 8 to 11 mph.
Monday Night
Mostly cloudy, with a low around 46. North wind 8 to 13 mph, with gusts as high as 23 mph.
Tuesday
Partly sunny, with a high near 63.
Tuesday Night
Partly cloudy, with a low around 45.
Wednesday
Mostly sunny, with a high near 58.
Wednesday Night
Partly cloudy, with a low around 45.
Thursday
Mostly sunny, with a high near 61.
Thursday Night
Partly cloudy, with a low around 47.
Friday
Mostly sunny, with a high near 59.
Friday Night
Partly cloudy, with a low around 45.
Saturday
Mostly sunny, with a high near 58.
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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:
2:22 am EDT Oct 18, 2026
Forecast Valid:
3am EDT Oct 18, 2026-6pm EDT Oct 24, 2026
 
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Additional Resources

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Chance of Precipitation