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

41°F

5°C

Humidity 47%
Wind Speed NW 10 G 21 mph
Barometer 30.00 in (1016.0 mb)
Dewpoint 22°F (-6°C)
Visibility 10.00 mi
Wind Chill35°F (2°C)
Last update 18 Nov 2:56 am EST
Extended Forecast for

Port Jefferson Station NY

  • Overnight

    Overnight: Mostly clear, with a low around 35. West wind around 11 mph.

    Low: 35 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 46. West wind 9 to 11 mph.

    High: 46 °F

    Sunny

  • Tuesday Night

    Tuesday Night: A 30 percent chance of rain after 1am. Increasing clouds, with a low around 36. Northwest wind around 6 mph becoming calm in the evening.

    Low: 36 °F

    Mostly Cloudy
    then Chance
    Rain

  • Wednesday

    Wednesday: Cloudy, then gradually becoming mostly sunny, with a high near 47. Calm wind becoming north around 6 mph.

    High: 47 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Mostly cloudy, with a low around 36. Calm wind becoming north around 5 mph after midnight.

    Low: 36 °F

    Mostly Cloudy

  • Thursday

    Thursday: Partly sunny, with a high near 49.

    High: 49 °F

    Partly Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 42.

    Low: 42 °F

    Mostly Cloudy

  • Friday

    Friday: A 40 percent chance of rain. Mostly cloudy, with a high near 55.

    High: 55 °F

    Chance Rain

  • Friday Night

    Friday Night: A 30 percent chance of rain. Mostly cloudy, with a low around 41.

    Low: 41 °F

    Chance Rain

Detailed Forecast

Overnight
Mostly clear, with a low around 35. West wind around 11 mph.
Tuesday
Sunny, with a high near 46. West wind 9 to 11 mph.
Tuesday Night
A 30 percent chance of rain after 1am. Increasing clouds, with a low around 36. Northwest wind around 6 mph becoming calm in the evening.
Wednesday
Cloudy, then gradually becoming mostly sunny, with a high near 47. Calm wind becoming north around 6 mph.
Wednesday Night
Mostly cloudy, with a low around 36. Calm wind becoming north around 5 mph after midnight.
Thursday
Partly sunny, with a high near 49.
Thursday Night
Mostly cloudy, with a low around 42.
Friday
A 40 percent chance of rain. Mostly cloudy, with a high near 55.
Friday Night
A 30 percent chance of rain. Mostly cloudy, with a low around 41.
Saturday
Partly sunny, with a high near 50.
Saturday Night
Partly cloudy, with a low around 36.
Sunday
Mostly sunny, with a high near 50.
Sunday Night
Partly cloudy, with a low around 38.
Monday
Mostly sunny, with a high near 52.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson Station NY
 40.93°N 73.06°W (Elev. 161 ft)
Last Update:
1:02 am EST Nov 18, 2025
Forecast Valid:
3am EST Nov 18, 2025-6pm EST Nov 24, 2025
 
Forecast Discussion
 
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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