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.

Blowing Snow and Windy

12°F

-11°C

Humidity 48%
Wind Speed NW 30 G 43 mph
Barometer 29.75 in (1007.6 mb)
Dewpoint -4°F (-20°C)
Visibility 3.00 mi
Wind Chill-10°F (-23°C)
Last update 7 Feb 4:56 pm EST
Extended Forecast for

Port Jefferson NY

Wind Advisory February 7, 05:52pm until February 8, 12:00am
Extreme Cold Warning February 7, 05:52pm until February 8, 01:00pm
Click here for hazard details and duration
Wind Advisory
Extreme Cold Warning
  •  
    Wind Advisory February 7, 05:52pm until February 8, 12:00am
    Extreme Cold Warning February 7, 05:52pm until February 8, 01:00pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 10 °F

    Chance Snow
    and Blustery

  • Tonight

    Tonight: A 30 percent chance of snow before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 3. Wind chill values between -10 and -15. Windy, with a northwest wind 20 to 28 mph, with gusts as high as 46 mph.

    Low: 3 °F

    Chance Snow
    and Windy
    then Partly
    Cloudy and
    Blustery

  • Sunday

    Sunday: Sunny and cold, with a high near 19. Wind chill values between -5 and -15. Northwest wind 16 to 18 mph, with gusts as high as 28 mph.

    High: 19 °F

    Cold

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 9. Wind chill values between -5 and 5. Northwest wind 10 to 14 mph, with gusts as high as 24 mph.

    Low: 9 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 29. Northwest wind 7 to 10 mph.

    High: 29 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 17.

    Low: 17 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 36.

    High: 36 °F

    Mostly Cloudy

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 27.

    Low: 27 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
A 30 percent chance of snow. Cloudy and cold, with a steady temperature around 10. Wind chill values between -5 and -10. Blustery, with a northwest wind around 25 mph, with gusts as high as 46 mph.
Tonight
A 30 percent chance of snow before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 3. Wind chill values between -10 and -15. Windy, with a northwest wind 20 to 28 mph, with gusts as high as 46 mph.
Sunday
Sunny and cold, with a high near 19. Wind chill values between -5 and -15. Northwest wind 16 to 18 mph, with gusts as high as 28 mph.
Sunday Night
Mostly clear, with a low around 9. Wind chill values between -5 and 5. Northwest wind 10 to 14 mph, with gusts as high as 24 mph.
Monday
Sunny, with a high near 29. Northwest wind 7 to 10 mph.
Monday Night
Partly cloudy, with a low around 17.
Tuesday
Mostly cloudy, with a high near 36.
Tuesday Night
Mostly cloudy, with a low around 27.
Wednesday
Partly sunny, with a high near 37.
Wednesday Night
Mostly clear, with a low around 22.
Thursday
Mostly sunny, with a high near 33.
Thursday Night
Partly cloudy, with a low around 21.
Friday
Partly sunny, with a high near 32.
Friday Night
Mostly cloudy, with a low around 22.
Saturday
Mostly sunny, with a high near 33.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.93°N 73.06°W (Elev. 161 ft)
Last Update:
4:23 pm EST Feb 7, 2026
Forecast Valid:
5pm EST Feb 7, 2026-6pm EST Feb 14, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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