Gateway Arch National Park in August
August at Gateway Arch National Park averages a daytime high near 87°F and an overnight low around 67°F, with about 3.1" of precipitation. Visitation runs about 1.4× the park's average month, which makes August a busy month here.
- Average low
- 67°F
- Average high
- 87°F
Range across the year: 22°F to 89°F
- Precipitation
- 3.1 in
- Daylight
- 13.5 hours
Roughly 11% of the park's yearly visitors come in August: about 196,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes August the 3rd-busiest of the park's twelve months, sitting between the July peak (2.9×) and the January low (0.3×).
On our Best Time to Visit score August rates 59/100 ("Fair"). Our recommended month is October: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 77°F is warm enough that midday heat is worth planning around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 4.1 miles from the park.
August falls inside the park's busiest stretch: June, July and August together pull about 48% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.
You'll have about 13.5 hours of daylight in August to explore — between the 9.3-hour midwinter low and the 14.7-hour summer high.
Park-wide, 2025 drew 2,209,028 recreation visits, down 13.8% from 2,563,052 in 2024.
Across the past decade overall visitation has risen about 37.8%, so a August visit is likely to feel busier than it did a few years ago.
How August compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| July | 89°F / 69°F | 2.9× Very busy | 30 Poor |
| August | 87°F / 67°F | 1.4× Busy | 59 Fair |
| September | 80°F / 59°F | 0.9× Average | 77 Excellent |
All twelve months at Gateway Arch, with the best time to visit.
Things to do at Gateway Arch in August
The National Park Service tags 14 Gateway Arch activities for summer. Here are 8 of them. Each links to the park's own page for it.
- Become a Trails & Rails Guide · reservation required
- Travel aboard Trails & Rails: Amtrak’s Lincoln Service between St. Louis and Springfield · 6 hours · reservation required
- A Moment of Reflection · 1-99 minutes
- Carve Your Own Path · 15-120 minutes
- Explore with Lewis and Clark · 1-99 minutes
- Move Along the Mississippi River
- Rise to the West · 5-20 minutes
- Shop at the Arch Store
Frequently Asked Questions
August averages a daytime high near 87°F and an overnight low around 67°F at Gateway Arch National Park, with about 3.1 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 4.1 miles from the park, so conditions inside the park can differ, especially at other elevations.
August is busy at Gateway Arch National Park (about 1.4× the average month). Our best-time score rates it "Fair" at 59/100. Our recommended month is October.
The busiest month is July and the quietest is January. August sits at about 1.4× the park's average, or 11% of annual visitation.
A typical August sees about 196,000 recreation visits at Gateway Arch National Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near Gateway Arch in August
Booking a August trip to Gateway Arch National Park? Compare hotels, cabins and vacation rentals near the park with live August availability and prices.
Top-rated places to stay near Gateway Arch
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.