September in Yosemite National Park is a good month: highs around 84°F, lows around 51°F. Crowds: busy — #4 busiest of the park's 12 months. Warm, calmer valley — climbers' season on El Cap. The editorial best window here is May–June.
| Verdict | Good A solid visit with a caveat — usually crowds or heat. |
|---|---|
| Temps °F | 84° high / 51° low |
| Crowds | busy · #4 busiest of the park's 12 months |
| What September is like | Warm, calmer valley — climbers' season on El Cap |
| Best window (whole year) | May–June |
| Peak crowds (whole year) | Jun–Aug |
CROWDS: RELATIVE SEASONALITY FROM NPS VISITATION STATISTICS · TEMPS: APPROXIMATE NOAA NORMALS AT MAIN VISITOR ELEVATION — HIGH COUNTRY RUNS 10–20°F COLDER
Yosemite National Park in October — Good, highs around 72°F, crowds: moderate (golden light and thin crowds).
Our verdict for September is "Good". A solid visit with a caveat — usually crowds or heat. Expect highs around 84°F and lows around 51°F, with crowds at the "busy" 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 May–June, and the peak-crowd months are Jun–Aug. September itself we rate "Good".
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