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.

Partly Cloudy

78°F

26°C

Humidity 42%
Wind Speed SE 10 G 18 mph
Barometer 30.05 in (1017.6 mb)
Dewpoint 53°F (12°C)
Visibility 10.00 mi
Heat Index79°F (26°C)
Last update 25 Jul 3:56 pm EDT
Extended Forecast for

Fort Salonga NY

  • Tonight

    Tonight: Mostly clear, with a low around 63. East wind 5 to 8 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 81. Northeast wind 3 to 8 mph.

    High: 81 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 65. South wind 3 to 7 mph.

    Low: 65 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 82. Light south wind increasing to 5 to 9 mph in the afternoon.

    High: 82 °F

    Sunny

  • Monday Night

    Monday Night: A 40 percent chance of showers. Mostly cloudy, with a low around 68. South wind 8 to 10 mph.

    Low: 68 °F

    Chance
    Showers

  • Tuesday

    Tuesday: Showers likely, then showers and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    High: 80 °F

    Showers

  • Tuesday Night

    Tuesday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 68. Chance of precipitation is 80%.

    Low: 68 °F

    Showers

  • Wednesday

    Wednesday: Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.

    High: 79 °F

    Showers
    Likely

  • Wednesday Night

    Wednesday Night: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.

    Low: 66 °F

    Showers
    Likely

Detailed Forecast

Tonight
Mostly clear, with a low around 63. East wind 5 to 8 mph becoming calm in the evening.
Sunday
Sunny, with a high near 81. Northeast wind 3 to 8 mph.
Sunday Night
Mostly clear, with a low around 65. South wind 3 to 7 mph.
Monday
Sunny, with a high near 82. Light south wind increasing to 5 to 9 mph in the afternoon.
Monday Night
A 40 percent chance of showers. Mostly cloudy, with a low around 68. South wind 8 to 10 mph.
Tuesday
Showers likely, then showers and possibly a thunderstorm after 2pm. High near 80. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
Showers and possibly a thunderstorm before 2am, then showers likely. Low around 68. Chance of precipitation is 80%.
Wednesday
Showers likely, with thunderstorms also possible after 2pm. Mostly cloudy, with a high near 79. Chance of precipitation is 60%.
Wednesday Night
Showers likely and possibly a thunderstorm before 8pm, then a chance of showers. Mostly cloudy, with a low around 66. Chance of precipitation is 60%.
Thursday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 82.
Thursday Night
A 30 percent chance of showers. Partly cloudy, with a low around 67.
Friday
Mostly sunny, with a high near 84.
Friday Night
Partly cloudy, with a low around 69.
Saturday
Mostly sunny, with a high near 85.
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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:
2:21 pm EDT Jul 25, 2026
Forecast Valid:
4pm EDT Jul 25, 2026-6pm EDT Aug 1, 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