How Crowded Is Tumacácori National Historical Park in September?

September runs about 0.5× Tumacácori National Historical Park's average month, which makes it a very quiet month here — roughly 4% of the park's yearly visitors come in September.

In a typical September the park sees roughly 1,500 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 9th-busiest of the park's twelve months, sitting between the December peak (2.2×) and the August low (0.4×).

On our Best Time to Visit score September rates 81/100 ("Excellent"), versus the top-rated August at 78/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 89°F and an overnight low around 60°F, with about 1.8" of precipitation.

That average of about 74°F is a comfortable range for hiking and being outdoors all day.

Because June, July and August together draw about 9% 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 10-hour midwinter low and the 14-hour summer high.

Park-wide, 2024 drew 35,256 recreation visits, down 6.9% from 37,872 in 2023.

Across the past decade overall visitation has eased about 20.6%, so September may feel a touch quieter than it once did.