Valley Forge National Historical Park in September
In September, Valley Forge National Historical Park averages a high of 79°F and a low of 56°F, with 4.4 inches of precipitation (rain plus melted snow). About 152,000 people visit, the 7th busiest of 12 (busy). Days are 12 hours 24 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 79° / 56°F
- Precipitation
- 4.4in
- Snow
- –in
- Daylight
- 12h 24m
- Visitors
- 152,000
- Crowds
- Busy
Best months for weather and crowds instead: April (busy), May (very busy) and November (busy).
Weather 1991–2020 averages at Phoenixville 1 E, PA, 3 miles from the park's center, 85 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Independence National Historical Park | 80° / 63° | Busy | Hot |
| Delaware Water Gap National Recreation Area | 74° / 52° | Very busy | Mild, wet |
| Statue of Liberty National Monument | 76° / 62° | Moderate | Mild, wet |
| Castle Clinton National Monument | 76° / 62° | Busy | Mild, wet |
| Stonewall National Monument | 76° / 62° | Few or no visits | Mild, wet |
Closures, reservations and alerts: Valley Forge National Historical Park on nps.gov
All twelve months at Valley Forge National Historical Park · National parks to visit in September