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

76°F

24°C

Humidity 88%
Wind Speed SE 9 mph
Barometer 30.09 in (1018.9 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index76°F (24°C)
Last update 13 Jul 9:56 pm EDT
Extended Forecast for

Port Jefferson Station NY

  • Tonight

    Tonight: Patchy drizzle after 5am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 71. Southeast wind around 6 mph becoming calm after midnight.

    Low: 71 °F

    Patchy Fog
    then Patchy
    Drizzle and
    Patchy Fog

  • Monday

    Monday: Patchy drizzle before 8am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. South wind 3 to 7 mph. Chance of precipitation is 20%.

    High: 83 °F

    Patchy
    Drizzle then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind around 6 mph.

    Low: 73 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Calm wind becoming south around 6 mph in the morning. Chance of precipitation is 40%.

    High: 85 °F

    Chance
    Showers

  • Tuesday Night

    Tuesday Night: A 20 percent chance of showers after 2am. Partly cloudy, with a low around 73. Southwest wind around 6 mph.

    Low: 73 °F

    Partly Cloudy
    then Slight
    Chance
    Showers

  • Wednesday

    Wednesday: Partly sunny, with a high near 88.

    High: 88 °F

    Partly Sunny

  • Wednesday Night

    Wednesday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 75.

    Low: 75 °F

    Chance
    Showers

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91.

    High: 91 °F

    Partly Sunny
    then Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 76.

    Low: 76 °F

    Chance
    T-storms then
    Mostly Cloudy

Detailed Forecast

Tonight
Patchy drizzle after 5am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 71. Southeast wind around 6 mph becoming calm after midnight.
Monday
Patchy drizzle before 8am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. South wind 3 to 7 mph. Chance of precipitation is 20%.
Monday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 73. Southwest wind around 6 mph.
Tuesday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 85. Calm wind becoming south around 6 mph in the morning. Chance of precipitation is 40%.
Tuesday Night
A 20 percent chance of showers after 2am. Partly cloudy, with a low around 73. Southwest wind around 6 mph.
Wednesday
Partly sunny, with a high near 88.
Wednesday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 75.
Thursday
A 30 percent chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 91.
Thursday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 76.
Friday
A 30 percent chance of showers after 2pm. Mostly sunny, with a high near 92.
Friday Night
A 30 percent chance of showers. Partly cloudy, with a low around 74.
Saturday
A 30 percent chance of showers. Mostly sunny, with a high near 87.
Saturday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 71.
Sunday
Mostly sunny, with a high near 85.
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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:
5:47 pm EDT Jul 13, 2025
Forecast Valid:
10pm EDT Jul 13, 2025-6pm EDT Jul 20, 2025
 
Forecast Discussion
 
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Additional Resources

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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