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

60°F

16°C

Humidity 44%
Wind Speed SE 18 mph
Barometer 30.35 in (1027.6 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Last update 22 May 4:56 pm EDT
Extended Forecast for

Port Jefferson Station NY

  • Tonight

    Tonight: Cloudy, with a low around 52. East wind 5 to 9 mph.

    Low: 52 °F

    Cloudy

  • Saturday

    Saturday: Rain, mainly after 2pm. High near 59. East wind 9 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

    High: 59 °F

    Chance Rain
    then Rain

  • Saturday Night

    Saturday Night: Rain. Low around 51. East wind 11 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

    Low: 51 °F

    Rain

  • Sunday

    Sunday: Rain before 2pm, then showers and possibly a thunderstorm after 2pm. High near 64. East wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

    High: 64 °F

    Showers

  • Sunday Night

    Sunday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 58. North wind 5 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 58 °F

    Showers

  • Memorial Day

    Memorial Day: A 50 percent chance of showers. Mostly cloudy, with a high near 76.

    High: 76 °F

    Chance
    Showers

  • Monday Night

    Monday Night: Mostly cloudy, with a low around 61.

    Low: 61 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Partly sunny, with a high near 80.

    High: 80 °F

    Partly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 62.

    Low: 62 °F

    Mostly Cloudy

Detailed Forecast

Tonight
Cloudy, with a low around 52. East wind 5 to 9 mph.
Saturday
Rain, mainly after 2pm. High near 59. East wind 9 to 13 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Rain. Low around 51. East wind 11 to 16 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday
Rain before 2pm, then showers and possibly a thunderstorm after 2pm. High near 64. East wind 14 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
Sunday Night
Showers and possibly a thunderstorm before 2am, then showers likely. Low around 58. North wind 5 to 7 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Memorial Day
A 50 percent chance of showers. Mostly cloudy, with a high near 76.
Monday Night
Mostly cloudy, with a low around 61.
Tuesday
Partly sunny, with a high near 80.
Tuesday Night
Mostly cloudy, with a low around 62.
Wednesday
Partly sunny, with a high near 83.
Wednesday Night
Partly cloudy, with a low around 61.
Thursday
Sunny, with a high near 79.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Mostly sunny, with a high near 76.
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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:
2:31 pm EDT May 22, 2026
Forecast Valid:
5pm EDT May 22, 2026-6pm EDT May 29, 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