Harry S Truman National Historic Site in September
September at Harry S Truman National Historic Site averages a daytime high near 79°F and an overnight low around 59°F, with about 3.1" of precipitation. Visitation runs about 1.3× the park's average month, which makes September a busy month here.
- Average low
- 59°F
- Average high
- 79°F
Range across the year: 22°F to 88°F
- Precipitation
- 3.1 in
- Daylight
- 12.2 hours
Roughly 10% of the park's yearly visitors come in September: roughly 2,700 recreation visits in a typical year, based on National Park Service monthly counts from 1984 to 2025.
That makes September the 5th-busiest of the park's twelve months, sitting between the July peak (1.8×) and the January low (0.3×).
On our Best Time to Visit score September rates 62/100 ("Good"). Our recommended month is October: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 69°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 8.1 miles from the park.
Because June, July and August together draw about 41% 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 9.3-hour midwinter low and the 14.7-hour summer high.
Park-wide, 2025 drew 19,296 recreation visits, down 19.9% from 24,102 in 2024.
Across the past decade overall visitation has eased about 32.5%, so September may feel a touch quieter than it once did.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 87°F / 68°F | 1.6× Busy | 40 Poor |
| September | 79°F / 59°F | 1.3× Busy | 62 Good |
| October | 67°F / 47°F | 1.2× Busy | 50 Fair |
All twelve months at Harry S Truman, with the best time to visit.
Frequently Asked Questions
September averages a daytime high near 79°F and an overnight low around 59°F at Harry S Truman National Historic Site, with about 3.1 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 8.1 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Harry S Truman National Historic Site (about 1.3× the average month). Our best-time score rates it "Good" at 62/100. Our recommended month is October.
The busiest month is July and the quietest is January. September sits at about 1.3× the park's average, or 10% of annual visitation.
A typical September sees about 3,000 recreation visits at Harry S Truman National Historic Site, based on National Park Service monthly counts from 1984–2025.
Where to stay near Harry S Truman in September
Booking a September trip to Harry S Truman National Historic Site? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Harry S Truman
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See the full ranking of the best national parks to visit in September.
Source: National Park Service Visitor Use Statistics (1984–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.