Casa Grande Ruins National Monument in September
September at Casa Grande Ruins National Monument averages a daytime high near 101°F and an overnight low around 70°F, with about 0.7" of precipitation. Visitation runs about 0.5× the park's average month, which makes September a quiet month here.
- Average low
- 70°F
- Average high
- 101°F
Range across the year: 36°F to 107°F
- Precipitation
- 0.7 in
- Daylight
- 12.2 hours
Roughly 4% of the park's yearly visitors come in September: roughly 3,300 recreation visits in a typical year, 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 March peak (2.2×) and the August low (0.4×).
On our Best Time to Visit score September rates 45/100 ("Fair"). Our recommended month is December: the lightest crowds of the park's good-weather months.
The daily average of about 85°F is hot, with afternoons near 101°F to plan the day around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 0.3 miles from the park.
Because June, July and August together draw about 12% 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 9.8-hour midwinter low and the 14.2-hour summer high.
Park-wide, 2024 drew 104,429 recreation visits, down 6.3% from 111,392 in 2023.
Across the past decade overall visitation has risen about 17.5%, so a September visit is likely to feel busier than it did a few years ago.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 105°F / 77°F | 0.4× Very quiet | 50 Fair |
| September | 101°F / 70°F | 0.5× Quiet | 45 Fair |
| October | 91°F / 56°F | 0.8× Quiet | 63 Good |
All twelve months at Casa Grande Ruins, with the best time to visit.
Frequently Asked Questions
September averages a daytime high near 101°F and an overnight low around 70°F at Casa Grande Ruins National Monument, with about 0.7 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 0.3 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is quiet at Casa Grande Ruins National Monument (about 0.5× the average month). Our best-time score rates it "Fair" at 45/100. Our recommended month is December.
The busiest month is March and the quietest is August. September sits at about 0.5× the park's average, or 4% of annual visitation.
A typical September sees about 3,000 recreation visits at Casa Grande Ruins National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Casa Grande Ruins in September
Booking a September trip to Casa Grande Ruins National Monument? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Casa Grande Ruins
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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.