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

73°F

23°C

Humidity 74%
Wind Speed SW 10 mph
Barometer 30.02 in (1016.3 mb)
Dewpoint 64°F (18°C)
Visibility 10.00 mi
Last update 1 Jul 1:56 am EDT
Extended Forecast for

Selden NY

Extreme Heat Watch July 3, 09:00pm until July 4, 09:00pm
Extreme Heat Warning July 1, 12:00pm until July 3, 09:00pm
Click here for hazard details and duration
Extreme Heat Watch
Extreme Heat Warning

  • Overnight

    Overnight: Partly cloudy, with a steady temperature around 74. Southwest wind around 9 mph.

    Low: 74 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 89. Heat index values as high as 95. Southwest wind 10 to 14 mph.

    High: 89 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 73. Southwest wind 9 to 13 mph.

    Low: 73 °F

    Slight Chance
    T-storms

  • Thursday

    Thursday: Sunny, with a high near 97. Heat index values as high as 107. Southwest wind 7 to 11 mph.

    High: 97 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 78. Southwest wind 5 to 10 mph becoming light after midnight.

    Low: 78 °F

    Clear

  • Friday

    Friday: Sunny and hot, with a high near 102.

    High: 102 °F

    Hot

  • Friday Night

    Friday Night: Partly cloudy, with a low around 77.

    Low: 77 °F

    Partly Cloudy

  • Independence Day

    Independence Day: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 98.

    High: 98 °F

    Sunny then
    Chance
    Showers

  • Saturday Night

    Saturday Night: A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 74.

    Low: 74 °F

    Chance
    Showers

Detailed Forecast

Overnight
Partly cloudy, with a steady temperature around 74. Southwest wind around 9 mph.
Wednesday
Mostly sunny, with a high near 89. Heat index values as high as 95. Southwest wind 10 to 14 mph.
Wednesday Night
A 20 percent chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 73. Southwest wind 9 to 13 mph.
Thursday
Sunny, with a high near 97. Heat index values as high as 107. Southwest wind 7 to 11 mph.
Thursday Night
Clear, with a low around 78. Southwest wind 5 to 10 mph becoming light after midnight.
Friday
Sunny and hot, with a high near 102.
Friday Night
Partly cloudy, with a low around 77.
Independence Day
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 98.
Saturday Night
A 40 percent chance of showers before 2am. Mostly cloudy, with a low around 74.
Sunday
A 40 percent chance of showers after 2pm. Partly sunny, with a high near 90.
Sunday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 71. Chance of precipitation is 70%.
Monday
A 50 percent chance of showers. Mostly cloudy, with a high near 86.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 85.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Selden NY
 40.89°N 73.07°W (Elev. 148 ft)
Last Update:
2:37 am EDT Jul 1, 2026
Forecast Valid:
3am EDT Jul 1, 2026-6pm EDT Jul 7, 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