National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

61°F

16°C

Humidity 72%
Wind Speed SE 10 mph
Barometer 30.06 in (1018.0 mb)
Dewpoint 52°F (11°C)
Visibility 10.00 mi
Last update 16 Oct 2:56 am EDT
Extended Forecast for

Port Jefferson Station NY

  • Overnight

    Overnight: A 30 percent chance of showers after 5am. Mostly cloudy, with a steady temperature around 57. Southeast wind around 7 mph.

    Low: 57 °F

    Chance
    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 2pm. High near 70. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    High: 70 °F

    Showers then
    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms before 2am, then showers likely. Low around 45. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 45 °F

    Showers

  • Saturday

    Saturday: A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 53. North wind 15 to 17 mph, with gusts as high as 29 mph.

    High: 53 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 40. North wind 11 to 15 mph.

    Low: 40 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 55.

    High: 55 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 44.

    Low: 44 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 58.

    High: 58 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 46.

    Low: 46 °F

    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers after 5am. Mostly cloudy, with a steady temperature around 57. Southeast wind around 7 mph.
Friday
Showers, with thunderstorms also possible after 2pm. High near 70. Southwest wind 11 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms before 2am, then showers likely. Low around 45. Southwest wind 9 to 13 mph becoming northwest after midnight. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A 30 percent chance of showers before 8am. Cloudy through mid morning, then gradual clearing, with a high near 53. North wind 15 to 17 mph, with gusts as high as 29 mph.
Saturday Night
Mostly clear, with a low around 40. North wind 11 to 15 mph.
Sunday
Sunny, with a high near 55.
Sunday Night
Mostly clear, with a low around 44.
Monday
Mostly sunny, with a high near 58.
Monday Night
Partly cloudy, with a low around 46.
Tuesday
Partly sunny, with a high near 62.
Tuesday Night
Partly cloudy, with a low around 49.
Wednesday
Sunny, with a high near 62.
Wednesday Night
Mostly clear, with a low around 47.
Thursday
Mostly sunny, with a high near 59.
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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:
2:39 am EDT Oct 16, 2026
Forecast Valid:
3am EDT Oct 16, 2026-6pm EDT Oct 22, 2026
 
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