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.

Overcast and Breezy

61°F

16°C

Humidity 67%
Wind Speed SW 21 G 36 mph
Barometer 29.65 in (1004.0 mb)
Dewpoint 50°F (10°C)
Visibility 10.00 mi
Last update 5 Nov 5:56 pm EST
Extended Forecast for

Port Jefferson NYSimilar City Names

Wind Advisory November 5, 09:00pm until November 6, 08:00am
Click here for hazard details and duration
Wind Advisory

  • Tonight

    Tonight: A chance of showers between 10pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 46. Windy, with a southwest wind 17 to 22 mph becoming west 26 to 31 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 30%.

    Low: 46 °F

    Chance
    Showers and
    Breezy then
    Mostly Clear
    and Windy

  • Thursday

    Thursday: Sunny, with a high near 54. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 40 mph.

    High: 54 °F

    Sunny and
    Breezy then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 39. Northwest wind 5 to 13 mph.

    Low: 39 °F

    Mostly Clear

  • Friday

    Friday: Partly sunny, with a high near 61. South wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon.

    High: 61 °F

    Partly Sunny

  • Friday Night

    Friday Night: Rain likely, mainly after 1am. Cloudy, with a low around 54. South wind 14 to 17 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 54 °F

    Chance Rain
    then Rain
    Likely

  • Saturday

    Saturday: Partly sunny, with a high near 63.

    High: 63 °F

    Partly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 50.

    Low: 50 °F

    Partly Cloudy

  • Sunday

    Sunday: Rain likely, mainly after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.

    High: 61 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance Rain

Detailed Forecast

Tonight
A chance of showers between 10pm and midnight. Mostly cloudy, then gradually becoming mostly clear, with a low around 46. Windy, with a southwest wind 17 to 22 mph becoming west 26 to 31 mph after midnight. Winds could gust as high as 50 mph. Chance of precipitation is 30%.
Thursday
Sunny, with a high near 54. Breezy, with a northwest wind 15 to 22 mph, with gusts as high as 40 mph.
Thursday Night
Mostly clear, with a low around 39. Northwest wind 5 to 13 mph.
Friday
Partly sunny, with a high near 61. South wind 5 to 10 mph increasing to 12 to 17 mph in the afternoon.
Friday Night
Rain likely, mainly after 1am. Cloudy, with a low around 54. South wind 14 to 17 mph. Chance of precipitation is 70%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Partly sunny, with a high near 63.
Saturday Night
Partly cloudy, with a low around 50.
Sunday
Rain likely, mainly after 1pm. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.
Sunday Night
A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 41.
Monday
Mostly sunny, with a high near 48.
Monday Night
Partly cloudy, with a low around 35.
Veterans Day
Mostly sunny, with a high near 46.
Tuesday Night
Partly cloudy, with a low around 38.
Wednesday
Mostly sunny, with a high near 52.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NYSimilar City Names
 40.95°N 73.05°W (Elev. 151 ft)
Last Update:
5:00 pm EST Nov 5, 2025
Forecast Valid:
6pm EST Nov 5, 2025-6pm EST Nov 12, 2025
 
Forecast Discussion
 
Get as KML Get as XML

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