Yosemite National Park weather in September
September in Yosemite National Park: nice, dry, with clean air — an excellent time to visit.
#3 of 12 months in Yosemite National Park · #55 of 604 destinations to visit in September · comfort 91/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Yosemite National Park climate normals — September
| Daytime high | 19°C / 67°F | 😎 nice |
|---|---|---|
| Nighttime low | 7°C / 44°F | |
| Feels like (high) | 17°C / 63°F | |
| Rainfall | 25 mm / 1 in | ☀️ dry |
| Rainy days | 6 days | |
| Humidity | 56% | 🍃 comfortable |
| Dew point | 2°C / 35°F | |
| Sunshine | 11.5 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Snowfall | 2.1 cm / 0.8 in | |
| Air quality (US AQI) | 42 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Yosemite National Park in September — FAQ
- Is September a good time to visit Yosemite National Park?
- September in Yosemite National Park: nice, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Yosemite National Park on SeasonMap's comfort score (91/100).
- What is the weather like in Yosemite National Park in September?
- In September, Yosemite National Park averages a daily high of 19.4°C and a low of 6.8°C, with about 24.9 mm of rain over roughly 5.6 rainy days.
- What is the air quality in Yosemite National Park in September?
- Yosemite National Park has a mean US Air Quality Index of about 42 in September.
- Does it snow in Yosemite National Park in September?
- Yosemite National Park sees roughly 2.1 cm of snowfall in September.