Pinnacles National Park weather in September
September in Pinnacles National Park: hot, dry, with clean air — an excellent time to visit.
#6 of 12 months in Pinnacles National Park · #143 of 604 destinations to visit in September · comfort 87/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Pinnacles National Park climate normals — September
| Daytime high | 29°C / 85°F | 🥵 hot |
|---|---|---|
| Nighttime low | 15°C / 59°F | |
| Feels like (high) | 29°C / 84°F | |
| Rainfall | 3 mm / 0.1 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 58% | 🍃 comfortable |
| Dew point | 10°C / 50°F | |
| Sunshine | 11.5 h/day | |
| Daylight | 12.4 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 35 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Where is Pinnacles National Park?
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Pinnacles National Park in September — FAQ
- Is September a good time to visit Pinnacles National Park?
- September in Pinnacles National Park: hot, dry, with clean air — an excellent time to visit. It ranks #6 of 12 months for Pinnacles National Park on SeasonMap's comfort score (87/100).
- What is the weather like in Pinnacles National Park in September?
- In September, Pinnacles National Park averages a daily high of 29.2°C and a low of 15.2°C, with about 2.6 mm of rain over roughly 1.4 rainy days.
- What is the air quality in Pinnacles National Park in September?
- Pinnacles National Park has a mean US Air Quality Index of about 35 in September.