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.

Overcast

76°F

24°C

Humidity 72%
Wind Speed N 6 mph
Barometer 29.87 in (1011.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index78°F (26°C)
Last update 10 Sep 11:56 pm EDT
Extended Forecast for

Fort Salonga NY

  • Overnight

    Overnight: Partly cloudy, with a low around 66. North wind around 6 mph.

    Low: 66 °F

    Partly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 79. North wind around 6 mph.

    High: 79 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. Light northeast wind.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 78. East wind 5 to 8 mph becoming south in the afternoon.

    High: 78 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers and possibly a thunderstorm after 2am. Low around 67. South wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 67 °F

    Mostly Cloudy
    then Showers

  • Sunday

    Sunday: Showers, mainly before 2pm. High near 80. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 80 °F

    Showers

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 65.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 77.

    High: 77 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 60.

    Low: 60 °F

    Partly Cloudy

Detailed Forecast

Overnight
Partly cloudy, with a low around 66. North wind around 6 mph.
Friday
Mostly sunny, with a high near 79. North wind around 6 mph.
Friday Night
Mostly clear, with a low around 62. Light northeast wind.
Saturday
Mostly sunny, with a high near 78. East wind 5 to 8 mph becoming south in the afternoon.
Saturday Night
Showers and possibly a thunderstorm after 2am. Low around 67. South wind 8 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers, mainly before 2pm. High near 80. Chance of precipitation is 80%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Partly cloudy, with a low around 65.
Monday
Mostly sunny, with a high near 77.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Partly cloudy, with a low around 64.
Wednesday
Sunny, with a high near 78.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 78.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fort Salonga NY
 40.92°N 73.3°W (Elev. 26 ft)
Last Update:
9:48 pm EDT Sep 10, 2026
Forecast Valid:
12am EDT Sep 11, 2026-6pm EDT Sep 17, 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