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.

Fog/Mist

9°C

48°F

Humidity 93%
Wind Speed SW 11 km/h
Barometer 1000.0 mb (29.53 in)
Dewpoint 8°C (46°F)
Visibility 4.02 km
Wind Chill7°C (45°F)
Last update 12 Mar 6:56 am EDT
Extended Forecast for

Selden NY

  • Today

    Today: Rain likely before 4pm, then snow, possibly mixed with rain. Temperature falling to around 4 by 4pm. Breezy, with a southwest wind 10 to 20 km/h becoming northwest 27 to 37 km/h in the morning. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half centimeter possible.

    High: 13 °C⇓

    Breezy.
    Chance Rain
    then
    Rain/Snow

  • Tonight

    Tonight: Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around -2. Northwest wind 10 to 13 km/h. Chance of precipitation is 80%. New snow accumulation of less than a half centimeter possible.

    Low: -2 °C

    Rain/Snow
    then Mostly
    Clear

  • Friday

    Friday: Increasing clouds, with a high near 7. Wind chill values between -5 and zero. South wind 5 to 10 km/h increasing to 18 to 23 km/h in the afternoon.

    High: 7 °C

    Increasing
    Clouds

  • Friday Night

    Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 5. South wind 16 to 18 km/h, with gusts as high as 39 km/h.

    Low: 5 °C

    Decreasing
    Clouds

  • Saturday

    Saturday: Sunny, with a high near 9. West wind 18 to 23 km/h, with gusts as high as 40 km/h.

    High: 9 °C

    Sunny

  • Saturday Night

    Saturday Night: Increasing clouds, with a low around 0.

    Low: 0 °C

    Increasing
    Clouds

  • Sunday

    Sunday: Cloudy, with a high near 8.

    High: 8 °C

    Cloudy

  • Sunday Night

    Sunday Night: Rain, mainly after 2am. Low around 4. Chance of precipitation is 80%.

    Low: 4 °C

    Chance Rain
    then Rain

  • Monday

    Monday: Rain and possibly a thunderstorm. High near 13. Chance of precipitation is 90%.

    High: 13 °C

    Rain

Detailed Forecast

Today
Rain likely before 4pm, then snow, possibly mixed with rain. Temperature falling to around 4 by 4pm. Breezy, with a southwest wind 10 to 20 km/h becoming northwest 27 to 37 km/h in the morning. Chance of precipitation is 80%. Total daytime snow accumulation of less than a half centimeter possible.
Tonight
Snow, possibly mixed with rain, becoming all snow after 7pm, then gradually ending. Low around -2. Northwest wind 10 to 13 km/h. Chance of precipitation is 80%. New snow accumulation of less than a half centimeter possible.
Friday
Increasing clouds, with a high near 7. Wind chill values between -5 and zero. South wind 5 to 10 km/h increasing to 18 to 23 km/h in the afternoon.
Friday Night
Mostly cloudy, then gradually becoming mostly clear, with a steady temperature around 5. South wind 16 to 18 km/h, with gusts as high as 39 km/h.
Saturday
Sunny, with a high near 9. West wind 18 to 23 km/h, with gusts as high as 40 km/h.
Saturday Night
Increasing clouds, with a low around 0.
Sunday
Cloudy, with a high near 8.
Sunday Night
Rain, mainly after 2am. Low around 4. Chance of precipitation is 80%.
Monday
Rain and possibly a thunderstorm. High near 13. Chance of precipitation is 90%.
Monday Night
Rain likely, mainly before 2am. Mostly cloudy, with a low around 0. Chance of precipitation is 70%.
Tuesday
A 30 percent chance of rain. Mostly sunny, with a high near 5.
Tuesday Night
Partly cloudy, with a low around -4.
Wednesday
Mostly sunny, with a high near 3.
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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 m)
Last Update:
7:04 am EDT Mar 12, 2026
Forecast Valid:
7am EDT Mar 12, 2026-6pm EDT Mar 18, 2026
 
Forecast Discussion
 
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Additional Resources

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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