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.

Overcast

59°F

15°C

Humidity 90%
Wind Speed SW 5 mph
Barometer 29.95 in (1014.0 mb)
Dewpoint 56°F (13°C)
Visibility 10.00 mi
Last update 14 May 11:56 pm EDT
Extended Forecast for

Port Jefferson NY

  • Overnight

    Overnight: A 30 percent chance of showers. Cloudy, with a low around 56. South wind 5 to 8 mph.

    Low: 56 °F

    Chance
    Showers

  • Wednesday

    Wednesday: Rain likely, mainly after 2pm. Cloudy, with a high near 66. Southeast wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 66 °F

    Rain Likely

  • Wednesday Night

    Wednesday Night: Rain likely. Cloudy, with a low around 55. Northeast wind 10 to 17 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Rain Likely

  • Thursday

    Thursday: Rain likely, mainly before 2pm. Cloudy, with a high near 63. Breezy, with a northeast wind 17 to 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

    High: 63 °F

    Rain Likely
    and Breezy

  • Thursday Night

    Thursday Night: A 30 percent chance of rain, mainly before 2am. Mostly cloudy, with a low around 56. Northeast wind 13 to 15 mph.

    Low: 56 °F

    Chance Rain

  • Friday

    Friday: Partly sunny, with a high near 68.

    High: 68 °F

    Partly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 54.

    Low: 54 °F

    Mostly Cloudy

  • Saturday

    Saturday: Mostly cloudy, with a high near 64.

    High: 64 °F

    Mostly Cloudy

  • Saturday Night

    Saturday Night: A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 54.

    Low: 54 °F

    Chance
    Showers

Detailed Forecast

Overnight
A 30 percent chance of showers. Cloudy, with a low around 56. South wind 5 to 8 mph.
Wednesday
Rain likely, mainly after 2pm. Cloudy, with a high near 66. Southeast wind 5 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Wednesday Night
Rain likely. Cloudy, with a low around 55. Northeast wind 10 to 17 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.
Thursday
Rain likely, mainly before 2pm. Cloudy, with a high near 63. Breezy, with a northeast wind 17 to 20 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.
Thursday Night
A 30 percent chance of rain, mainly before 2am. Mostly cloudy, with a low around 56. Northeast wind 13 to 15 mph.
Friday
Partly sunny, with a high near 68.
Friday Night
Mostly cloudy, with a low around 54.
Saturday
Mostly cloudy, with a high near 64.
Saturday Night
A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 54.
Sunday
A 30 percent chance of showers before 2pm. Mostly cloudy, with a high near 65.
Sunday Night
Mostly cloudy, with a low around 53.
Monday
Partly sunny, with a high near 66.
Monday Night
Mostly cloudy, with a low around 54.
Tuesday
Partly sunny, with a high near 70.
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Map Legend

ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
Last Update:
10:21 pm EDT May 14, 2024
Forecast Valid:
12am EDT May 15, 2024-6pm EDT May 21, 2024
 
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