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.

Light Rain

59°F

15°C

Humidity 87%
Wind Speed NE 8 mph
Barometer 30.23 in (1023.7 mb)
Dewpoint 55°F (13°C)
Visibility 10.00 mi
Last update 21 May 2:54 pm EDT
Extended Forecast for

Williamstown NJ

  • This Afternoon

    This Afternoon: Showers. High near 63. Northeast wind around 10 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

    High: 63 °F

    Showers

  • Tonight

    Tonight: Showers likely, mainly before midnight. Cloudy, with a low around 50. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 50 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Friday

    Friday: A chance of showers, mainly before noon. Cloudy, with a high near 62. East wind 5 to 15 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    High: 62 °F

    Chance
    Showers

  • Friday Night

    Friday Night: A chance of showers before midnight, then rain likely, mainly after 2am. Cloudy, with a low around 47. East wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 47 °F

    Rain Likely

  • Saturday

    Saturday: Rain. High near 57. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 57 °F

    Rain

  • Saturday Night

    Saturday Night: Rain. Low around 49. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.

    Low: 49 °F

    Rain

  • Sunday

    Sunday: Rain likely before 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.

    High: 68 °F

    Rain Likely

  • Sunday Night

    Sunday Night: A chance of showers after 8pm. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.

    Low: 55 °F

    Chance
    Showers

  • Memorial Day

    Memorial Day: A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%.

    High: 70 °F

    Chance
    Showers

Detailed Forecast

This Afternoon
Showers. High near 63. Northeast wind around 10 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers likely, mainly before midnight. Cloudy, with a low around 50. East wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday
A chance of showers, mainly before noon. Cloudy, with a high near 62. East wind 5 to 15 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night
A chance of showers before midnight, then rain likely, mainly after 2am. Cloudy, with a low around 47. East wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday
Rain. High near 57. East wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Saturday Night
Rain. Low around 49. Chance of precipitation is 100%. New precipitation amounts between three quarters and one inch possible.
Sunday
Rain likely before 2pm. Mostly cloudy, with a high near 68. Chance of precipitation is 70%.
Sunday Night
A chance of showers after 8pm. Mostly cloudy, with a low around 55. Chance of precipitation is 40%.
Memorial Day
A chance of showers. Mostly cloudy, with a high near 70. Chance of precipitation is 40%.
Monday Night
A chance of showers before 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 40%.
Tuesday
A chance of showers. Mostly cloudy, with a high near 75. Chance of precipitation is 30%.
Tuesday Night
Mostly cloudy, with a low around 58.
Wednesday
Partly sunny, with a high near 82.
Wednesday Night
Mostly cloudy, with a low around 59.
Thursday
Mostly sunny, with a high near 80.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Williamstown NJ
 39.69°N 74.97°W (Elev. 148 ft)
Last Update:
2:28 pm EDT May 21, 2026
Forecast Valid:
3pm EDT May 21, 2026-6pm EDT May 28, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

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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