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.

Mostly Cloudy

29°F

-2°C

Humidity 51%
Wind Speed W 9 mph
Barometer 29.74 in
Dewpoint 13°F (-11°C)
Visibility 10.00 mi
Wind Chill21°F (-6°C)
Last update 2 Jan 4:56 pm EST
Extended Forecast for

Port Jefferson Station NY

  • This Afternoon

    This Afternoon: Scattered flurries. Partly sunny, with a high near 29. Wind chill values between 15 and 20. West wind around 14 mph.

    High: 29 °F

    Scattered
    Flurries

  • Tonight

    Tonight: Scattered flurries before 7pm. Partly cloudy, with a low around 18. Wind chill values between 10 and 15. West wind 9 to 11 mph, with gusts as high as 21 mph.

    Low: 18 °F

    Scattered
    Flurries

  • Saturday

    Saturday: Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 8 to 11 mph.

    High: 30 °F

    Increasing
    Clouds

  • Saturday Night

    Saturday Night: A slight chance of snow showers between 10pm and 1am, then a chance of light snow after 1am. Cloudy, with a low around 21. West wind 3 to 5 mph. Chance of precipitation is 50%.

    Low: 21 °F

    Slight Chance
    Snow Showers
    then Chance
    Light Snow

  • Sunday

    Sunday: A 20 percent chance of light snow before 10am. Partly sunny, with a high near 33. Northwest wind 6 to 13 mph.

    High: 33 °F

    Slight Chance
    Light Snow
    then Partly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 16.

    Low: 16 °F

    Partly Cloudy

  • Monday

    Monday: Increasing clouds, with a high near 31.

    High: 31 °F

    Increasing
    Clouds

  • Monday Night

    Monday Night: Cloudy, with a low around 23.

    Low: 23 °F

    Cloudy

  • Tuesday

    Tuesday: Mostly cloudy, with a high near 41.

    High: 41 °F

    Mostly Cloudy

Detailed Forecast

This Afternoon
Scattered flurries. Partly sunny, with a high near 29. Wind chill values between 15 and 20. West wind around 14 mph.
Tonight
Scattered flurries before 7pm. Partly cloudy, with a low around 18. Wind chill values between 10 and 15. West wind 9 to 11 mph, with gusts as high as 21 mph.
Saturday
Increasing clouds, with a high near 30. Wind chill values between 10 and 20. West wind 8 to 11 mph.
Saturday Night
A slight chance of snow showers between 10pm and 1am, then a chance of light snow after 1am. Cloudy, with a low around 21. West wind 3 to 5 mph. Chance of precipitation is 50%.
Sunday
A 20 percent chance of light snow before 10am. Partly sunny, with a high near 33. Northwest wind 6 to 13 mph.
Sunday Night
Partly cloudy, with a low around 16.
Monday
Increasing clouds, with a high near 31.
Monday Night
Cloudy, with a low around 23.
Tuesday
Mostly cloudy, with a high near 41.
Tuesday Night
Mostly cloudy, with a low around 32.
Wednesday
Mostly cloudy, with a high near 44.
Wednesday Night
Partly cloudy, with a low around 30.
Thursday
Mostly sunny, with a high near 44.
Thursday Night
Mostly cloudy, with a low around 34.
Friday
A chance of rain. Mostly cloudy, with a high near 47.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson Station NY
 40.93°N 73.06°W (Elev. 161 ft)
Last Update:
3:52 pm EST Jan 2, 2026
Forecast Valid:
5pm EST Jan 2, 2026-6pm EST Jan 9, 2026
 
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Additional Resources

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