Cali weather in September
September in Cali: warm, rainy, with clean air — one of the best months to visit.
#2 of 12 months in Cali · #464 of 897 destinations to visit in September · comfort 82/100 (tier A)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Cali in September
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Cali climate normals — September
| Daytime high | 25°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 18°C / 64°F | |
| Rainfall | 132 mm / 5.2 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 81% | 💦 very humid |
| Dew point | 18°C / 64°F | |
| Sunshine | 8.3 h/day | |
| Daylight | 12.1 h | |
| Wind | 8 km/h / 5 mph | |
| Air quality (US AQI) | 32 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Cali in September — FAQ
- Is September a good time to visit Cali?
- September in Cali: warm, rainy, with clean air — one of the best months to visit. It ranks #2 of 12 months for Cali on SeasonMap's comfort score (82/100).
- What is the weather like in Cali in September?
- In September, Cali averages a daily high of 25.3°C and a low of 17.6°C, with about 132.4 mm of rain over roughly 17.6 rainy days.
- What is the air quality in Cali in September?
- Cali has a mean US Air Quality Index of about 32 in September.