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

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Mostly Cloudy

78°F

26°C

Humidity 69%
Wind Speed W 8 mph
Barometer 29.91 in (1012.7 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index80°F (27°C)
Last update 14 Oct 5:54 pm EDT
Extended Forecast for

Williamstown NJ

  • Tonight

    Tonight: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Increasing clouds, with a low around 56. West wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Chance
    Showers

  • Thursday

    Thursday: Mostly sunny, with a high near 66. North wind around 5 mph becoming east in the afternoon.

    High: 66 °F

    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 55. East wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 55 °F

    Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: A chance of showers before 11am, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 79. Southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Chance
    Showers

  • Friday Night

    Friday Night: Showers and thunderstorms. Low around 47. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 47 °F

    Showers

  • Saturday

    Saturday: A chance of showers before 8am. Mostly sunny, with a high near 55. Breezy. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 55 °F

    Breezy.
    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Patchy frost. Otherwise, mostly clear, with a low around 37.

    Low: 37 °F

    Patchy Frost

  • Sunday

    Sunday: Patchy frost before 10am. Otherwise, sunny, with a high near 57.

    High: 57 °F

    Patchy Frost
    then Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 39.

    Low: 39 °F

    Mostly Clear

Detailed Forecast

Tonight
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 1am. Increasing clouds, with a low around 56. West wind 5 to 10 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
Mostly sunny, with a high near 66. North wind around 5 mph becoming east in the afternoon.
Thursday Night
A chance of showers, then showers likely and possibly a thunderstorm after 4am. Increasing clouds, with a low around 55. East wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
A chance of showers before 11am, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 79. Southwest wind around 10 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms. Low around 47. Southwest wind 10 to 15 mph becoming northwest after midnight. Winds could gust as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers before 8am. Mostly sunny, with a high near 55. Breezy. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Patchy frost. Otherwise, mostly clear, with a low around 37.
Sunday
Patchy frost before 10am. Otherwise, sunny, with a high near 57.
Sunday Night
Mostly clear, with a low around 39.
Monday
Sunny, with a high near 63.
Monday Night
Partly cloudy, with a low around 43.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Sunny, with a high near 67.
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ABOUT THIS FORECAST

 
Point Forecast:
Williamstown NJ
 39.69°N 74.97°W (Elev. 148 ft)
Last Update:
4:11 pm EDT Oct 14, 2026
Forecast Valid:
6pm EDT Oct 14, 2026-6pm EDT Oct 21, 2026
 
Forecast Discussion
 
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Additional Resources

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National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation