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.

Mostly Cloudy

72°F

22°C

Humidity 84%
Wind Speed W 5 mph
Barometer 29.99 in (1015.5 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 22 Aug 3:56 pm EDT
Extended Forecast for

Fort Salonga NY

  • Tonight

    Tonight: Patchy drizzle before 11pm, then a slight chance of showers and thunderstorms between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. East wind around 7 mph. Chance of precipitation is 60%.

    Low: 66 °F

    Patchy
    Showers then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 82. East wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

    High: 82 °F

    Showers
    Likely then
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of thunderstorms before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 64. West wind around 8 mph. Chance of precipitation is 30%.

    Low: 64 °F

    Chance
    T-storms then
    Clear

  • Monday

    Monday: Sunny, with a high near 80. Southwest wind 6 to 10 mph.

    High: 80 °F

    Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 62. West wind around 8 mph.

    Low: 62 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 80.

    High: 80 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 65.

    Low: 65 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 81.

    High: 81 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

Detailed Forecast

Tonight
Patchy drizzle before 11pm, then a slight chance of showers and thunderstorms between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. East wind around 7 mph. Chance of precipitation is 60%.
Sunday
Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Mostly cloudy, with a high near 82. East wind 7 to 9 mph becoming south in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.
Sunday Night
A chance of thunderstorms before 8pm. Mostly cloudy, then gradually becoming clear, with a low around 64. West wind around 8 mph. Chance of precipitation is 30%.
Monday
Sunny, with a high near 80. Southwest wind 6 to 10 mph.
Monday Night
Mostly clear, with a low around 62. West wind around 8 mph.
Tuesday
Sunny, with a high near 80.
Tuesday Night
Mostly clear, with a low around 65.
Wednesday
Sunny, with a high near 81.
Wednesday Night
Partly cloudy, with a low around 67.
Thursday
Mostly sunny, with a high near 81.
Thursday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 68.
Friday
A 30 percent chance of showers. Partly sunny, with a high near 82.
Friday Night
Partly cloudy, with a low around 68.
Saturday
Mostly sunny, with a high near 82.
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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:
2:45 pm EDT Aug 22, 2026
Forecast Valid:
4pm EDT Aug 22, 2026-6pm EDT Aug 29, 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