Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Partly Cloudy

21°F

-6°C

Humidity 45%
Wind Speed W 13 mph
Barometer 29.99 in (1015.7 mb)
Dewpoint 3°F (-16°C)
Visibility 10.00 mi
Wind Chill8°F (-13°C)
Last update 27 Jan 12:56 pm EST
Extended Forecast for

Port Jefferson NY

  • This Afternoon

    This Afternoon: A chance of flurries.  Mostly sunny early, then becoming cloudy, with a high near 21. Wind chill values between 5 and 10. Breezy, with a southwest wind 17 to 22 mph.

    High: 21 °F

    Chance
    Flurries and
    Breezy

  • Tonight

    Tonight: Partly cloudy, with a low around 17. Wind chill values between zero and 5. Breezy, with a west wind 18 to 22 mph.

    Low: 17 °F

    Partly Cloudy
    and Breezy

  • Wednesday

    Wednesday: Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 10 to 16 mph.

    High: 22 °F

    Increasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 14. Wind chill values between zero and 10. West wind around 11 mph.

    Low: 14 °F

    Mostly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 21. West wind 13 to 15 mph.

    High: 21 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 12.

    Low: 12 °F

    Mostly Clear

  • Friday

    Friday: Sunny and cold, with a high near 19.

    High: 19 °F

    Cold

  • Friday Night

    Friday Night: Partly cloudy, with a low around 9.

    Low: 9 °F

    Partly Cloudy

  • Saturday

    Saturday: Partly sunny, with a high near 22.

    High: 22 °F

    Partly Sunny

Detailed Forecast

This Afternoon
A chance of flurries. Mostly sunny early, then becoming cloudy, with a high near 21. Wind chill values between 5 and 10. Breezy, with a southwest wind 17 to 22 mph.
Tonight
Partly cloudy, with a low around 17. Wind chill values between zero and 5. Breezy, with a west wind 18 to 22 mph.
Wednesday
Increasing clouds, with a high near 22. Wind chill values between zero and 10. West wind 10 to 16 mph.
Wednesday Night
Mostly cloudy, with a low around 14. Wind chill values between zero and 10. West wind around 11 mph.
Thursday
Sunny, with a high near 21. West wind 13 to 15 mph.
Thursday Night
Mostly clear, with a low around 12.
Friday
Sunny and cold, with a high near 19.
Friday Night
Partly cloudy, with a low around 9.
Saturday
Partly sunny, with a high near 22.
Saturday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 19. Windy.
Sunday
A 50 percent chance of snow. Mostly cloudy, with a high near 28. Windy.
Sunday Night
A 30 percent chance of snow. Mostly cloudy, with a low around 21. Windy.
Monday
Mostly sunny, with a high near 31. Blustery.
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.96°N 73.08°W (Elev. 3 ft)
12:48 pm EST Jan 27, 2026
1pm EST Jan 27, 2026-6pm EST Feb 2, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

National Digital Forecast Database