Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Fair

27°F

-3°C

Humidity 51%
Wind Speed NW 12 mph
Barometer 30.05 in (1017.7 mb)
Dewpoint 11°F (-12°C)
Visibility 10.00 mi
Wind Chill16°F (-9°C)
Last update 5 Feb 11:56 am EST
Extended Forecast for

Port Jefferson NY

  • This Afternoon

    This Afternoon: Sunny, with a high near 28. Wind chill values between 15 and 20. Northwest wind around 7 mph.

    High: 28 °F

    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 20. Wind chill values between 10 and 15. North wind 6 to 8 mph.

    Low: 20 °F

    Partly Cloudy

  • Friday

    Friday: Mostly cloudy, with a high near 28. Wind chill values between 10 and 20. Northeast wind 5 to 8 mph becoming light and variable  in the afternoon.

    High: 28 °F

    Mostly Cloudy

  • Friday Night

    Friday Night: Snow likely, mainly after 1am.  Cloudy, with a steady temperature around 25. Wind chill values between 15 and 25. Southwest wind 3 to 8 mph.  Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

    Low: 25 °F

    Slight Chance
    Snow then
    Snow Likely

  • Saturday

    Saturday: Snow likely, mainly before noon, then a slight chance of snow showers after 1pm.  Cloudy, with a temperature rising to near 23 by 10am, then falling to around 16 during the remainder of the day. Windy, with a northwest wind 18 to 23 mph increasing to 32 to 37 mph in the afternoon. Winds could gust as high as 55 mph.  Chance of precipitation is 60%. New snow accumulation of around an inch possible.

    High: 23 °F

    Windy. Snow
    Likely then
    Chance Snow

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 8. Very windy.

    Low: 8 °F

    Partly Cloudy
    and Very
    Windy

  • Sunday

    Sunday: Sunny and cold, with a high near 18. Windy.

    High: 18 °F

    Cold and
    Windy

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 12. Blustery.

    Low: 12 °F

    Mostly Clear
    and Blustery
    then Mostly
    Clear

  • Monday

    Monday: Mostly sunny, with a high near 26.

    High: 26 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 28. Wind chill values between 15 and 20. Northwest wind around 7 mph.
Tonight
Partly cloudy, with a low around 20. Wind chill values between 10 and 15. North wind 6 to 8 mph.
Friday
Mostly cloudy, with a high near 28. Wind chill values between 10 and 20. Northeast wind 5 to 8 mph becoming light and variable in the afternoon.
Friday Night
Snow likely, mainly after 1am. Cloudy, with a steady temperature around 25. Wind chill values between 15 and 25. Southwest wind 3 to 8 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.
Saturday
Snow likely, mainly before noon, then a slight chance of snow showers after 1pm. Cloudy, with a temperature rising to near 23 by 10am, then falling to around 16 during the remainder of the day. Windy, with a northwest wind 18 to 23 mph increasing to 32 to 37 mph in the afternoon. Winds could gust as high as 55 mph. Chance of precipitation is 60%. New snow accumulation of around an inch possible.
Saturday Night
Partly cloudy, with a low around 8. Very windy.
Sunday
Sunny and cold, with a high near 18. Windy.
Sunday Night
Mostly clear, with a low around 12. Blustery.
Monday
Mostly sunny, with a high near 26.
Monday Night
Partly cloudy, with a low around 19.
Tuesday
Mostly sunny, with a high near 31.
Tuesday Night
Mostly cloudy, with a low around 23.
Wednesday
Mostly cloudy, with a high near 33.
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.96°N 73.08°W (Elev. 3 ft)
1:31 am EST Feb 5, 2026
12pm EST Feb 5, 2026-6pm EST Feb 11, 2026
 
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Additional Resources

Radar & Satellite Image

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Hourly Weather Forecast

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