August is a good month at Gateway Arch — it ranks 10th of the twelve here. Expect about 54% fewer visitors than July, the park's peak — 217,260 visits on average. Days run around 87°F by afternoon and 67°F at night, with 13.7 hours of daylight.
August against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| August (this page) | Good | 217,260 | −54% | 87°F | 67°F | 0" | 13.7 h |
| October (best) | Excellent | 125,733 | −74% | 70°F | 46°F | 0" | 11.1 h |
| July (peak crowds) | Tough | 476,195 | peak | 89°F | 69°F | 0" | 14.6 h |
Weather figures are for downtown St. Louis — the Cahokia station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is August a good time to visit Gateway Arch?
It is a reasonable month — the park has stronger ones, but the records don't argue against it. August ranks 10 of 12 at Gateway Arch on crowds, weather, daylight, and access together.
How crowded is Gateway Arch in August?
About 217,260 recreation visits on average — 54% below July, the park's peak.
How warm is Gateway Arch in August?
Average highs around 87°F and lows around 67°F at the Cahokia station.
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