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Valley Forge National Historical Park in September

Average1.1× average month · best-time score 63/100Our recommended month

September at Valley Forge National Historical Park averages a daytime high near 79°F and an overnight low around 56°F, with about 4.4" of precipitation. Visitation runs about 1.1× the park's average month, which makes September an average month here.

Average low
56°F
Average high
79°F

Range across the year: 23°F to 88°F

Crowds
1.1× averageAverage
  1. J
  2. F
  3. M
  4. A
  5. M
  6. J
  7. J
  8. A
  9. S
  10. O
  11. N
  12. D
Precipitation
4.4 in
Daylight
12.2 hours

Roughly 9% of the park's yearly visitors come in September: about 172,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 6th-busiest of the park's twelve months, sitting between the July peak (1.5×) and the January low (0.4×).

September is our recommended month at Valley Forge: pleasant weather with noticeably thinner crowds (shoulder season).

The daily average of about 68°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 2.6 miles from the park.

Because June, July and August together draw about 35% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.2 hours of daylight in September to explore — between the 9.2-hour midwinter low and the 14.8-hour summer high.

Park-wide, 2025 drew 1,819,086 recreation visits, down 2.5% from 1,866,480 in 2024.

Across the past decade overall visitation has eased about 18.9%, so September may feel a touch quieter than it once did.

How September compares with the months around it

MonthAvg high / lowCrowdsBest-time score
August86°F / 64°F1.3× Busy46 Fair
September79°F / 56°F1.1× Average63 Good
October67°F / 44°F1.2× Busy43 Poor

All twelve months at Valley Forge, with the best time to visit.

Things to do at Valley Forge in September

The National Park Service tags 14 Valley Forge activities for fall. Here are 8 of them. Each links to the park's own page for it.

Reviewed by WhenToVisitParks Editorial Team · Updated

Frequently Asked Questions

September averages a daytime high near 79°F and an overnight low around 56°F at Valley Forge National Historical Park, with about 4.4 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 2.6 miles from the park, so conditions inside the park can differ, especially at other elevations.

September is average at Valley Forge National Historical Park (about 1.1× the average month). Our best-time score rates it "Good" at 63/100. September is our recommended month for this park.

The busiest month is July and the quietest is January. September sits at about 1.1× the park's average, or 9% of annual visitation.

A typical September sees about 172,000 recreation visits at Valley Forge National Historical Park, based on National Park Service monthly counts from 1979–2025.

Where to stay near Valley Forge in September

Booking a September trip to Valley Forge National Historical Park? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.

Top-rated places to stay near Valley Forge

Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.

Availability and prices from Stay22 partners (Booking.com, Vrbo, Expedia). We may earn a commission from bookings, at no extra cost to you.

Visiting Valley Forge in September?

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See the full ranking of the best national parks to visit in September.

Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.