Big Sur weather in September
September in Big Sur: nice, dry, with clean air — one of the best months to visit.
#2 of 12 months in Big Sur · #154 of 897 destinations to visit in September · comfort 90/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Big Sur in September
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Big Sur climate normals — September
| Daytime high | 24°C / 75°F | 😎 nice |
|---|---|---|
| Nighttime low | 17°C / 62°F | |
| Rainfall | 6 mm / 0.2 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 74% | 💧 humid |
| Dew point | 14°C / 57°F | |
| Sunshine | 11.4 h/day | |
| Daylight | 12.4 h | |
| Wind | 19 km/h / 11 mph | |
| Air quality (US AQI) | 33 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Big Sur in September — FAQ
- Is September a good time to visit Big Sur?
- September in Big Sur: nice, dry, with clean air — one of the best months to visit. It ranks #2 of 12 months for Big Sur on SeasonMap's comfort score (90/100).
- What is the weather like in Big Sur in September?
- In September, Big Sur averages a daily high of 23.7°C and a low of 16.6°C, with about 5.5 mm of rain over roughly 0.8 rainy days.
- What is the air quality in Big Sur in September?
- Big Sur has a mean US Air Quality Index of about 33 in September.