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

Brandywine Regional Airport (KOQN)

Lat: 39.99°NLon: 75.58°WElev: 465ft.

Mostly Cloudy

26°C

79°F

Humidity 79%
Wind Speed S 6 km/h
Barometer 30.09 in
Dewpoint 22°C (72°F)
Visibility 16 km
Heat Index28°C (82°F)
Last update 12 Jul 9:55 pm EDT
Extended Forecast for

Valley Forge PA

  • Tonight

    Tonight: Mostly cloudy, with a low around 21. Southeast wind 5 to 10 km/h.

    Low: 21 °C

    Mostly Cloudy

  • Sunday

    Sunday: A slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 31. East wind 5 to 10 km/h. Chance of precipitation is 20%.

    High: 31 °C

    Mostly Cloudy
    then Slight
    Chance
    T-storms

  • Sunday Night

    Sunday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 22. South wind 5 to 10 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 22 °C

    Chance
    T-storms then
    Showers
    Likely

  • Monday

    Monday: Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 30. Calm wind. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.

    High: 30 °C

    Showers
    Likely

  • Monday Night

    Monday Night: Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 21. Calm wind. Chance of precipitation is 60%. New precipitation amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.

    Low: 21 °C

    Showers
    Likely then
    Slight Chance
    Showers

  • Tuesday

    Tuesday: A slight chance of showers after 2pm. Mostly sunny, with a high near 32. Chance of precipitation is 20%.

    High: 32 °C

    Mostly Sunny
    then Slight
    Chance
    Showers

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 22.

    Low: 22 °C

    Partly Cloudy

  • Wednesday

    Wednesday: A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 32. Chance of precipitation is 40%.

    High: 32 °C

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.

    Low: 23 °C

    Chance
    T-storms

Detailed Forecast

Tonight
Mostly cloudy, with a low around 21. Southeast wind 5 to 10 km/h.
Sunday
A slight chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 31. East wind 5 to 10 km/h. Chance of precipitation is 20%.
Sunday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 22. South wind 5 to 10 km/h. Chance of precipitation is 60%. New rainfall amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Monday
Showers likely before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 30. Calm wind. Chance of precipitation is 70%. New rainfall amounts between 2.5 and 5 mm possible.
Monday Night
Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 21. Calm wind. Chance of precipitation is 60%. New precipitation amounts between 1 and 2.5 mm, except higher amounts possible in thunderstorms.
Tuesday
A slight chance of showers after 2pm. Mostly sunny, with a high near 32. Chance of precipitation is 20%.
Tuesday Night
Partly cloudy, with a low around 22.
Wednesday
A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 32. Chance of precipitation is 40%.
Wednesday Night
A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 23. Chance of precipitation is 30%.
Thursday
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 32. Chance of precipitation is 50%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 23. Chance of precipitation is 40%.
Friday
Showers likely and possibly a thunderstorm. Partly sunny, with a high near 32. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 22. Chance of precipitation is 60%.
Saturday
A chance of showers. Partly sunny, with a high near 30. Chance of precipitation is 40%.
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ABOUT THIS FORECAST

 
Point Forecast:
Valley Forge PA
 40.08°N 75.48°W (Elev. 230 m)
Last Update:
4:12 pm EDT Jul 12, 2025
Forecast Valid:
10pm EDT Jul 12, 2025-6pm EDT Jul 19, 2025
 
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