July in Zion National Park is a tough month: highs around 100°F, lows around 68°F. Crowds: peak crowds — #1 busiest of the park's 12 months. It is the park's warmest month of the year. 100°F+ heat; monsoon flash-flood risk in slot canyons. The editorial best window here is April–May & October.
| Verdict | Tough Closures, harsh weather or very limited access — plan carefully. |
|---|---|
| Temps °F | 100° high / 68° low — the park's warmest month |
| Crowds | peak crowds · #1 busiest of the park's 12 months |
| What July is like | 100°F+ heat; monsoon flash-flood risk in slot canyons |
| Best window (whole year) | April–May & October |
| Peak crowds (whole year) | May–Jul, Sep |
CROWDS: RELATIVE SEASONALITY FROM NPS VISITATION STATISTICS · TEMPS: APPROXIMATE NOAA NORMALS AT MAIN VISITOR ELEVATION — HIGH COUNTRY RUNS 10–20°F COLDER
Zion National Park in August — Tough, highs around 97°F, crowds: busy (monsoon continues — storms can close the narrows).
Our verdict for July is "Tough". Closures, harsh weather or very limited access — plan carefully. Expect highs around 100°F and lows around 68°F, with crowds at the "peak crowds" level. Temperatures are approximate NOAA normals at the main visitor elevation; crowd levels follow published NPS visitation statistics.
Across the full 12-month review, the best window is April–May & October, and the peak-crowd months are May–Jul, Sep. July itself we rate "Tough".
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