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

67°F

19°C

Humidity 57%
Wind Speed SE 6 mph
Barometer 30.15 in (1021.0 mb)
Dewpoint 51°F (11°C)
Visibility 10.00 mi
Last update 15 Oct 5:54 pm EDT
Extended Forecast for

Williamstown NJ

  • Tonight

    Tonight: Showers likely, with thunderstorms also possible after 5am. Increasing clouds, with a low around 56. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 56 °F

    Slight Chance
    Showers then
    Showers
    Likely

  • Friday

    Friday: Showers likely and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and noon. Cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 79 °F

    Showers
    Likely then
    Mostly Sunny

  • Friday Night

    Friday Night: Showers and thunderstorms before 4am, then showers likely. Low around 46. West wind 5 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 46 °F

    Showers then
    Showers
    Likely

  • Saturday

    Saturday: A chance of showers, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 54. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 54 °F

    Chance
    Showers then
    Mostly Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 35. North wind around 10 mph.

    Low: 35 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy frost between 7am and 8am. 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

  • Monday

    Monday: Sunny, with a high near 63.

    High: 63 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 42.

    Low: 42 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely, with thunderstorms also possible after 5am. Increasing clouds, with a low around 56. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday
Showers likely and possibly a thunderstorm before 11am, then a slight chance of showers between 11am and noon. Cloudy through mid morning, then gradual clearing, with a high near 79. Southwest wind 10 to 15 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Friday Night
Showers and thunderstorms before 4am, then showers likely. Low around 46. West wind 5 to 15 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers, mainly before 7am. Cloudy, then gradually becoming mostly sunny, with a high near 54. North wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Saturday Night
Mostly clear, with a low around 35. North wind around 10 mph.
Sunday
Patchy frost between 7am and 8am. 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 42.
Tuesday
Mostly sunny, with a high near 66.
Tuesday Night
Partly cloudy, with a low around 46.
Wednesday
Sunny, with a high near 67.
Wednesday Night
Mostly clear, with a low around 45.
Thursday
Sunny, with a high near 64.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Williamstown NJ
 39.69°N 74.97°W (Elev. 148 ft)
Last Update:
4:09 pm EDT Oct 15, 2026
Forecast Valid:
6pm EDT Oct 15, 2026-6pm EDT Oct 22, 2026
 
Forecast Discussion
 
Get as KML Get as XML

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