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 Snow Fog/Mist

26°F

-3°C

Humidity 88%
Wind Speed NW 5 mph
Barometer 29.56 in (1001.2 mb)
Dewpoint 23°F (-5°C)
Visibility 3.00 mi
Wind Chill20°F (-7°C)
Last update 6 Feb 11:56 pm EST
Extended Forecast for

Port Jefferson NY

Wind Advisory February 7, 09:00am until February 8, 12:00am
Extreme Cold Warning February 7, 01:00pm until February 8, 01:00pm
Click here for hazard details and duration
Wind Advisory
Extreme Cold Warning

  • Overnight

    Overnight: Snow, mainly after 1am. Steady temperature around 27. Wind chill values between 20 and 25. West wind 5 to 7 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than one inch possible.

    Low: 27 °F

    Snow

  • Saturday

    Saturday: Snow, mainly before 1pm. Temperature falling to around 14 by 5pm. Wind chill values between -5 and 5. Windy, with a northwest wind 14 to 19 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 46 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

    High: 26 °F⇓

    Snow and
    Windy

  • Saturday Night

    Saturday Night: Cloudy during the early evening, then gradual clearing, with a low around 7. Wind chill values between -5 and -10. Windy, with a northwest wind 22 to 31 mph, with gusts as high as 49 mph.

    Low: 7 °F

    Gradual
    Clearing and
    Windy

  • Sunday

    Sunday: Sunny and cold, with a high near 19. Wind chill values between -5 and -15. Blustery, with a northwest wind 21 to 25 mph.

    High: 19 °F

    Cold and
    Blustery

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 11. Blustery, with a northwest wind 16 to 22 mph.

    Low: 11 °F

    Mostly Clear
    and Blustery

  • Monday

    Monday: Increasing clouds, with a high near 25.

    High: 25 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Partly cloudy, with a low around 19.

    Low: 19 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 30.

    High: 30 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 24.

    Low: 24 °F

    Mostly Cloudy

Detailed Forecast

Overnight
Snow, mainly after 1am. Steady temperature around 27. Wind chill values between 20 and 25. West wind 5 to 7 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of less than one inch possible.
Saturday
Snow, mainly before 1pm. Temperature falling to around 14 by 5pm. Wind chill values between -5 and 5. Windy, with a northwest wind 14 to 19 mph increasing to 25 to 30 mph in the afternoon. Winds could gust as high as 46 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.
Saturday Night
Cloudy during the early evening, then gradual clearing, with a low around 7. Wind chill values between -5 and -10. Windy, with a northwest wind 22 to 31 mph, with gusts as high as 49 mph.
Sunday
Sunny and cold, with a high near 19. Wind chill values between -5 and -15. Blustery, with a northwest wind 21 to 25 mph.
Sunday Night
Mostly clear, with a low around 11. Blustery, with a northwest wind 16 to 22 mph.
Monday
Increasing clouds, with a high near 25.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 30.
Tuesday Night
Mostly cloudy, with a low around 24.
Wednesday
A chance of rain and snow after 1pm. Mostly cloudy, with a high near 33. Chance of precipitation is 40%.
Wednesday Night
A chance of rain and snow. Mostly cloudy, with a low around 27. Chance of precipitation is 40%.
Thursday
A 30 percent chance of snow. Partly sunny, with a high near 33.
Thursday Night
Partly cloudy, with a low around 24.
Friday
Mostly sunny, with a high near 32.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.96°N 73.08°W (Elev. 3 ft)
Last Update:
3:22 pm EST Feb 6, 2026
Forecast Valid:
12am EST Feb 7, 2026-6pm EST Feb 13, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation