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.

Light Rain

69°F

21°C

Humidity 96%
Wind Speed W 8 mph
Barometer 29.69 in (1005.3 mb)
Dewpoint 68°F (20°C)
Visibility 9.00 mi
Last update 27 Jun 4:56 am EDT
Extended Forecast for

Port Jefferson NY

  • Overnight

    Overnight: A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 68. Southwest wind around 7 mph.

    Low: 68 °F

    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms before 7am. Cloudy through mid morning, then gradual clearing, with a high near 84. West wind around 8 mph.

    High: 84 °F

    Chance
    Showers then
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. West wind 9 to 13 mph becoming north after midnight.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 77. North wind 5 to 10 mph becoming southeast in the afternoon.

    High: 77 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62. South wind 6 to 9 mph.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81.

    High: 81 °F

    Partly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 70%.

    Low: 73 °F

    Chance
    T-storms then
    Showers
    Likely

  • Sunday

    Sunday: Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 85. Chance of precipitation is 70%.

    High: 85 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before midnight. Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    Showers then
    Partly Cloudy

Detailed Forecast

Overnight
A 30 percent chance of showers and thunderstorms. Cloudy, with a low around 68. Southwest wind around 7 mph.
Thursday
A 30 percent chance of showers and thunderstorms before 7am. Cloudy through mid morning, then gradual clearing, with a high near 84. West wind around 8 mph.
Thursday Night
Mostly clear, with a low around 64. West wind 9 to 13 mph becoming north after midnight.
Friday
Sunny, with a high near 77. North wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
Mostly clear, with a low around 62. South wind 6 to 9 mph.
Saturday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 81.
Saturday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 73. Chance of precipitation is 70%.
Sunday
Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 85. Chance of precipitation is 70%.
Sunday Night
A 30 percent chance of showers before midnight. Partly cloudy, with a low around 67.
Monday
Sunny, with a high near 82.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny, with a high near 82.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
Mostly sunny, with a high near 83.
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ABOUT THIS FORECAST

 
Point Forecast:
Port Jefferson NY
 40.95°N 73.05°W (Elev. 151 ft)
Last Update:
3:42 am EDT Jun 27, 2024
Forecast Valid:
5am EDT Jun 27, 2024-6pm EDT Jul 3, 2024
 
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