On July 7, 2015, NWS implemented changes to the icons depicted on all of its point-forecast pages. Changes include new icon images with increased clarity, 6-hour increments for rapidly changing weather and new color blocks to highlight forecast hazards.

A page depicting all of the new icon images can be accessed here: www.weather.gov/forecast-icons

Changes to the icons were based on analysis of 6,700 public comments collected in 2014. Also, many of these changes are based on the results of a research project led by the National Center for Atmospheric Research.

Users are encouraged to continue to provide comments regarding these changes via email at icons@noaa.gov. NWS will continue to analyze incoming feedback and refine the icons as necessary. Any substantial change to the icons will be facilitated through the NWS public comment/review process.

Slight risk of severe weather on Sunday

The NWS Storm Prediction Center expects a slight risk of severe weather in portions of the Great Lakes and Midwest on Sunday. The area of greatest concern is in Michigan, southeast Wisconsin, northern Illinois, and northern Indiana. The primary risks for this area will be damaging winds and large hail, but an isolated tornado cannot be ruled out.
Read More...

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

A Few Clouds

81°F

27°C

Humidity 45%
Wind Speed NW 6 mph
Barometer 29.78 in (1008.2 mb)
Dewpoint 58°F (14°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 1 Aug 7:56 pm EDT
Extended Forecast for

Port Jefferson NY

  • Tonight

    Tonight: Mostly clear, with a low around 67. West wind 5 to 8 mph becoming calm  after midnight.

    Mostly Clear

    Low: 67 °F

  • Sunday

    Sunday: Sunny, with a high near 86. Light and variable wind becoming southwest 5 to 9 mph in the morning.

    Sunny

    High: 86 °F

  • Sunday
    Night

    Sunday Night: Mostly clear, with a low around 69. South wind 3 to 8 mph.

    Mostly Clear

    Low: 69 °F

  • Monday

    Monday: Mostly sunny, with a high near 89. South wind 5 to 13 mph.

    Mostly Sunny

    High: 89 °F

  • Monday
    Night

    Monday Night: A chance of showers and thunderstorms, mainly after midnight.  Mostly cloudy, with a low around 71. South wind 10 to 16 mph.  Chance of precipitation is 30%.

    Chance
    T-storms

    Low: 71 °F

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms.  Mostly sunny, with a high near 88. Chance of precipitation is 20%.

    Slight Chance
    T-storms

    High: 88 °F

  • Tuesday
    Night

    Tuesday Night: Partly cloudy, with a low around 70.

    Partly Cloudy

    Low: 70 °F

  • Wednesday

    Wednesday: Mostly sunny, with a high near 83.

    Mostly Sunny

    High: 83 °F

  • Wednesday
    Night

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

    Mostly Cloudy

    Low: 67 °F

Detailed Forecast

Tonight
Mostly clear, with a low around 67. West wind 5 to 8 mph becoming calm after midnight.
Sunday
Sunny, with a high near 86. Light and variable wind becoming southwest 5 to 9 mph in the morning.
Sunday Night
Mostly clear, with a low around 69. South wind 3 to 8 mph.
Monday
Mostly sunny, with a high near 89. South wind 5 to 13 mph.
Monday Night
A chance of showers and thunderstorms, mainly after midnight. Mostly cloudy, with a low around 71. South wind 10 to 16 mph. Chance of precipitation is 30%.
Tuesday
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 70.
Wednesday
Mostly sunny, with a high near 83.
Wednesday Night
Mostly cloudy, with a low around 67.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 80. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Friday
Partly sunny, with a high near 79.
Friday Night
Mostly cloudy, with a low around 67.
Saturday
A chance of showers and thunderstorms. Partly sunny, with a high near 79. Chance of precipitation is 30%.
  Click Map For Forecast
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
6:37 pm EDT Aug 1, 2015
8pm EDT Aug 1, 2015-6pm EDT Aug 8, 2015
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Northeast Radar Mosaic Link to Satellite Data

Hourly Weather Graph

National Digital Forecast Database