Santa Barbara weather in September
September in Santa Barbara: warm, dry, with clean air — an excellent time to visit.
#3 of 12 months in Santa Barbara · #52 of 897 destinations to visit in September · comfort 94/100 (tier S)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Santa Barbara in September
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Santa Barbara climate normals — September
| Daytime high | 28°C / 83°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 65°F | |
| Rainfall | 8 mm / 0.3 in | ☀️ dry |
| Rainy days | 1 days | |
| Humidity | 64% | 💧 humid |
| Dew point | 15°C / 59°F | |
| Sunshine | 11.4 h/day | |
| Daylight | 12.4 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 36 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Santa Barbara in September — FAQ
- Is September a good time to visit Santa Barbara?
- September in Santa Barbara: warm, dry, with clean air — an excellent time to visit. It ranks #3 of 12 months for Santa Barbara on SeasonMap's comfort score (94/100).
- What is the weather like in Santa Barbara in September?
- In September, Santa Barbara averages a daily high of 28.4°C and a low of 18.4°C, with about 7.6 mm of rain over roughly 1.4 rainy days.
- What is the air quality in Santa Barbara in September?
- Santa Barbara has a mean US Air Quality Index of about 36 in September.