National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

75°F

24°C

Humidity 50%
Wind Speed S 8 mph
Barometer 30.14 in (1020.5 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 12 Sep 10:56 am EDT
Extended Forecast for

Selden NY

Flood Watch September 13, 05:00am until September 13, 02:00pm
Click here for hazard details and duration
Flood Watch

  • Today

    Today: Partly sunny, with a high near 76. South wind 6 to 8 mph.

    High: 76 °F

    Partly Sunny

  • Tonight

    Tonight: A chance of showers and thunderstorms between 2am and 5am, then showers and possibly a thunderstorm after 5am. Low around 64. South wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 64 °F

    Mostly Cloudy
    then Showers

  • Sunday

    Sunday: Showers and possibly a thunderstorm before 2pm, then a slight chance of showers. Some of the storms could produce heavy rainfall. High near 77. South wind around 8 mph becoming west in the afternoon. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 77 °F

    Heavy Rain

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 63. Calm wind becoming west around 5 mph after midnight.

    Low: 63 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 74. North wind 10 to 13 mph.

    High: 74 °F

    Slight Chance
    Showers

  • Monday Night

    Monday Night: Mostly clear, with a low around 55.

    Low: 55 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

Detailed Forecast

Today
Partly sunny, with a high near 76. South wind 6 to 8 mph.
Tonight
A chance of showers and thunderstorms between 2am and 5am, then showers and possibly a thunderstorm after 5am. Low around 64. South wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
Showers and possibly a thunderstorm before 2pm, then a slight chance of showers. Some of the storms could produce heavy rainfall. High near 77. South wind around 8 mph becoming west in the afternoon. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Partly cloudy, with a low around 63. Calm wind becoming west around 5 mph after midnight.
Monday
A 20 percent chance of showers before 2pm. Mostly sunny, with a high near 74. North wind 10 to 13 mph.
Monday Night
Mostly clear, with a low around 55.
Tuesday
Sunny, with a high near 71.
Tuesday Night
Partly cloudy, with a low around 57.
Wednesday
Mostly sunny, with a high near 75.
Wednesday Night
Mostly clear, with a low around 62.
Thursday
Mostly sunny, with a high near 78.
Thursday Night
Partly cloudy, with a low around 63.
Friday
Mostly sunny, with a high near 77.
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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:
2:21 am EDT Sep 12, 2026
Forecast Valid:
11am EDT Sep 12, 2026-6pm EDT Sep 18, 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