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.

Light Rain Fog/Mist

73°F

23°C

Humidity 90%
Wind Speed E 13 mph
Barometer 29.98 in (1014.9 mb)
Dewpoint 70°F (21°C)
Visibility 3.00 mi
Last update 31 Jul 6:56 pm EDT
Extended Forecast for

Port Jefferson Station NY

Flood Watch July 31, 07:44pm until August 1, 08:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch July 31, 07:44pm until August 1, 08:00am

    NOW until 8:00am Fri

    Flood Watch

  • Tonight

    Low: 64 °F

    Showers

  • Friday

    Friday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 74. Northeast wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 74 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday Night

    Friday Night: Partly cloudy, with a low around 62. Northeast wind 9 to 13 mph.

    Low: 62 °F

    Partly Cloudy

  • Saturday

    Saturday: Sunny, with a high near 81. North wind 6 to 10 mph.

    High: 81 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 63. South wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 84.

    High: 84 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm, then showers after 11pm. Low around 64. Northeast wind 11 to 15 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.
Friday
Showers likely, mainly before 8am. Mostly cloudy, with a high near 74. Northeast wind around 17 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night
Partly cloudy, with a low around 62. Northeast wind 9 to 13 mph.
Saturday
Sunny, with a high near 81. North wind 6 to 10 mph.
Saturday Night
Mostly clear, with a low around 63. South wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 84.
Sunday Night
Mostly clear, with a low around 67.
Monday
Sunny, with a high near 85.
Monday Night
Partly cloudy, with a low around 67.
Tuesday
Mostly sunny, with a high near 84.
Tuesday Night
Mostly cloudy, with a low around 67.
Wednesday
Partly sunny, with a high near 82.
Wednesday Night
Mostly cloudy, with a low around 68.
Thursday
A 30 percent chance of showers. Partly sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson Station NY
 40.93°N 73.06°W (Elev. 161 ft)
Last Update:
5:53 pm EDT Jul 31, 2025
Forecast Valid:
7pm EDT Jul 31, 2025-6pm EDT Aug 7, 2025
 
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