Heavy rain for portions of the Mid-Atlantic and New England through Saturday

A slow-moving weather system in the eastern U.S. will focus showers and thunderstorms across portions of New England and the Mid-Atlantic through Saturday. Abundant moisture will allow occasionally heavy rainfall and flash flooding in these locations. Read More >

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Light Rain

79°F

26°C

Humidity 74%
Wind Speed SW 6 mph
Barometer 29.88 in (1011.5 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 28 Jul 9:56 pm EDT
Extended Forecast for

Port Jefferson NY

Flash Flood Watch until July 29, 06:00pm
Click here for hazard details and duration
Flash Flood Watch
  •  
    Flash Flood Watch until July 29, 06:00pm

    NOW until
    6:00pm Fri

    Flash Flood Watch

  • Tonight

    Tonight: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rain.  Low around 74. Light and variable wind.  Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Heavy Rain

    Low: 74 °F

  • Friday

    Friday: Showers and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Some of the storms could produce heavy rain.  Steady temperature around 76. East wind 9 to 17 mph becoming north in the morning.  Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.

    Heavy Rain

    High: 76 °F

  • Friday
    Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm.  Cloudy, then gradually becoming partly cloudy, with a low around 67. North wind 5 to 7 mph becoming light and variable.

    Chance
    T-storms then
    Mostly Cloudy

    Low: 67 °F

  • Saturday

    Saturday: Mostly sunny, with a high near 83. North wind 5 to 8 mph becoming south in the afternoon.

    Mostly Sunny

    High: 83 °F

  • Saturday
    Night

    Saturday Night: A 40 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 71. South wind 3 to 7 mph.

    Chance
    T-storms

    Low: 71 °F

  • Sunday

    Sunday: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a high near 81.

    Chance
    T-storms

    High: 81 °F

  • Sunday
    Night

    Sunday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 71.

    Chance
    T-storms

    Low: 71 °F

  • Monday

    Monday: Partly sunny, with a high near 81.

    Partly Sunny

    High: 81 °F

Detailed Forecast

Tonight
Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Some of the storms could produce heavy rain. Low around 74. Light and variable wind. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Friday
Showers and possibly a thunderstorm before 2pm, then a chance of showers and thunderstorms after 2pm. Some of the storms could produce heavy rain. Steady temperature around 76. East wind 9 to 17 mph becoming north in the morning. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Cloudy, then gradually becoming partly cloudy, with a low around 67. North wind 5 to 7 mph becoming light and variable.
Saturday
Mostly sunny, with a high near 83. North wind 5 to 8 mph becoming south in the afternoon.
Saturday Night
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71. South wind 3 to 7 mph.
Sunday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 81.
Sunday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 71.
Monday
Partly sunny, with a high near 81.
Monday Night
Mostly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 82.
Tuesday Night
Mostly clear, with a low around 70.
Wednesday
Mostly sunny, with a high near 84.
Wednesday Night
Partly cloudy, with a low around 71.
Thursday
Mostly sunny, with a high near 85.
Click Map For Forecast
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
7:36 pm EDT Jul 28, 2016
10pm EDT Jul 28, 2016-6pm EDT Aug 4, 2016
 
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Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database