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.

Fair

24°F

-4°C

Humidity 50%
Wind Speed W 14 G 23 mph
Barometer 30.01 in (1016.3 mb)
Dewpoint 8°F (-13°C)
Visibility 10.00 mi
Wind Chill12°F (-11°C)
Last update 15 Jan 2:56 am EST
Extended Forecast for

Port Jefferson NY

  • Overnight

    Overnight: Mostly clear, with a low around 23. Wind chill values between 10 and 15. Northwest wind around 18 mph.

    Low: 23 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 32. Wind chill values between 10 and 20. Breezy, with a northwest wind 16 to 21 mph.

    High: 32 °F

    Sunny and
    Breezy

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 22. Wind chill values between 15 and 20. Northwest wind 8 to 17 mph.

    Low: 22 °F

    Partly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 31. Wind chill values between 15 and 25. Southwest wind 7 to 9 mph.

    High: 31 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: A 20 percent chance of snow showers before 4am. Cloudy, then gradually becoming partly cloudy, with a low around 25. Northwest wind around 7 mph.

    Low: 25 °F

    Slight Chance
    Snow Showers

  • Friday

    Friday: Sunny, with a high near 38.

    High: 38 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 30.

    Low: 30 °F

    Partly Cloudy

  • Saturday

    Saturday: Rain likely after 1pm. Mostly cloudy, with a high near 45. Chance of precipitation is 60%.

    High: 45 °F

    Mostly Cloudy
    then Rain
    Likely

  • Saturday Night

    Saturday Night: A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 33.

    Low: 33 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 23. Wind chill values between 10 and 15. Northwest wind around 18 mph.
Wednesday
Sunny, with a high near 32. Wind chill values between 10 and 20. Breezy, with a northwest wind 16 to 21 mph.
Wednesday Night
Partly cloudy, with a low around 22. Wind chill values between 15 and 20. Northwest wind 8 to 17 mph.
Thursday
Partly sunny, with a high near 31. Wind chill values between 15 and 25. Southwest wind 7 to 9 mph.
Thursday Night
A 20 percent chance of snow showers before 4am. Cloudy, then gradually becoming partly cloudy, with a low around 25. Northwest wind around 7 mph.
Friday
Sunny, with a high near 38.
Friday Night
Partly cloudy, with a low around 30.
Saturday
Rain likely after 1pm. Mostly cloudy, with a high near 45. Chance of precipitation is 60%.
Saturday Night
A 40 percent chance of rain before 1am. Mostly cloudy, with a low around 33.
Sunday
A chance of rain and snow after 1pm. Partly sunny, with a high near 40. Chance of precipitation is 40%.
Sunday Night
A 50 percent chance of snow. Mostly cloudy, with a low around 21.
M.L.King Day
Mostly sunny, with a high near 28.
Monday Night
Partly cloudy, with a low around 12.
Tuesday
Mostly sunny, with a high near 21.
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
Last Update:
3:11 am EST Jan 15, 2025
Forecast Valid:
3am EST Jan 15, 2025-6pm EST Jan 21, 2025
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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