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WhenToVisitParks

Fort Union National Monument in August

Busy1.2× average month · best-time score 64/100

August at Fort Union National Monument averages a daytime high near 85°F and an overnight low around 51°F, with about 2.8" of precipitation. Visitation runs about 1.2× the park's average month, which makes August a busy month here.

Average low
51°F
Average high
85°F

Range across the year: 14°F to 88°F

Crowds
1.2× averageBusy
  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
2.8 in
Daylight
13.4 hours

Roughly 10% of the park's yearly visitors come in August: roughly 1,100 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.

That makes August the 4th-busiest of the park's twelve months, sitting between the June peak (1.7×) and the January low (0.3×).

On our Best Time to Visit score August rates 64/100 ("Good"). Our recommended month is October: the lightest crowds of the park's good-weather months.

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 8 miles from the park.

August falls inside the park's busiest stretch: June, July and August together pull about 37% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.

You'll have about 13.4 hours of daylight in August to explore — between the 9.6-hour midwinter low and the 14.4-hour summer high.

Park-wide, 2024 drew 9,217 recreation visits, down 3.7% from 9,570 in 2023.

Across the past decade overall visitation has eased about 12.5%, so August may feel a touch quieter than it once did.

How August compares with the months around it

MonthAvg high / lowCrowdsBest-time score
July88°F / 52°F1.5× Busy48 Fair
August85°F / 51°F1.2× Busy64 Good
September80°F / 43°F1.2× Busy57 Fair

All twelve months at Fort Union, with the best time to visit.

Reviewed by WhenToVisitParks Editorial Team · Updated

Frequently Asked Questions

August averages a daytime high near 85°F and an overnight low around 51°F at Fort Union National Monument, with about 2.8 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 8 miles from the park, so conditions inside the park can differ, especially at other elevations.

August is busy at Fort Union National Monument (about 1.2× the average month). Our best-time score rates it "Good" at 64/100. Our recommended month is October.

The busiest month is June and the quietest is January. August sits at about 1.2× the park's average, or 10% of annual visitation.

A typical August sees about 1,000 recreation visits at Fort Union National Monument, based on National Park Service monthly counts from 1979–2025.

Where to stay near Fort Union in August

Booking a August trip to Fort Union National Monument? Compare hotels, cabins and vacation rentals near the park with live August availability and prices.

Top-rated places to stay near Fort Union

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

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

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