May is an excellent month at Gateway Arch — it ranks 4th of the twelve here. Expect about 64% fewer visitors than July, the park's peak — 170,789 visits on average. Days run around 76°F by afternoon and 56°F at night, with 14.3 hours of daylight.
May against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| May (this page) | Excellent | 170,789 | −64% | 76°F | 56°F | 0" | 14.3 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 May a good time to visit Gateway Arch?
Yes — it is one of the best months of the year here. May ranks 4 of 12 at Gateway Arch on crowds, weather, daylight, and access together.
How crowded is Gateway Arch in May?
About 170,789 recreation visits on average — 64% below July, the park's peak.
How warm is Gateway Arch in May?
Average highs around 76°F and lows around 56°F at the Cahokia station.
← Gateway Arch in April · All months at Gateway Arch · Gateway Arch in June →