Agate Fossil Beds National Monument in September
September at Agate Fossil Beds National Monument averages a daytime high near 76°F and an overnight low around 39°F, with about 1.2" of precipitation. Visitation runs about 1.6× the park's average month, which makes September a busy month here.
- Average low
- 39°F
- Average high
- 76°F
Range across the year: 8°F to 87°F
- Precipitation
- 1.2 in
- Daylight
- 12.3 hours
Roughly 13% of the park's yearly visitors come in September: roughly 2,200 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 4th-busiest of the park's twelve months, sitting between the August peak (2.8×) and the January low (0.1×).
September is our recommended month at Agate Fossil Beds: the lightest crowds of the park's good-weather months.
The daily average of about 58°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 0.9 miles from the park.
Because June, July and August together draw about 61% 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 12.3 hours of daylight in September to explore — between the 8.9-hour midwinter low and the 15.1-hour summer high.
Park-wide, 2025 drew 16,827 recreation visits, down 13.2% from 19,395 in 2024.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 85°F / 49°F | 2.8× Very busy | 52 Fair |
| September | 76°F / 39°F | 1.6× Busy | 59 Fair |
| October | 62°F / 27°F | 0.8× Quiet | 54 Fair |
All twelve months at Agate Fossil Beds, with the best time to visit.
Frequently Asked Questions
September averages a daytime high near 76°F and an overnight low around 39°F at Agate Fossil Beds National Monument, with about 1.2 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 0.9 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is busy at Agate Fossil Beds National Monument (about 1.6× the average month). Our best-time score rates it "Fair" at 59/100. September is our recommended month for this park.
The busiest month is August and the quietest is January. September sits at about 1.6× the park's average, or 13% of annual visitation.
A typical September sees about 2,000 recreation visits at Agate Fossil Beds National Monument, based on National Park Service monthly counts from 1979–2025.
Where to stay near Agate Fossil Beds in September
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Top-rated places to stay near Agate Fossil Beds
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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.