Chengdu weather in September
September in Chengdu: warm, rainy, with poor air quality — a good time to visit.
#10 of 12 months in Chengdu · #485 of 604 destinations to visit in September · comfort 63/100 (tier C)
Updated June 2026 · climate normals from ERA5 reanalysis
Chengdu climate normals — September
| Daytime high | 26°C / 78°F | 🌤 warm |
|---|---|---|
| Nighttime low | 20°C / 67°F | |
| Feels like (high) | 28°C / 82°F | |
| Rainfall | 126 mm / 5 in | 🌧 rainy |
| Rainy days | 12 days | |
| Humidity | 77% | 💦 very humid |
| Dew point | 19°C / 65°F | |
| Sunshine | 6.1 h/day | |
| Daylight | 12.3 h | |
| Wind | 11 km/h / 7 mph | |
| Air quality (US AQI) | 140 | 😷 poor |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Chengdu in September — FAQ
- Is September a good time to visit Chengdu?
- September in Chengdu: warm, rainy, with poor air quality — a good time to visit. It ranks #10 of 12 months for Chengdu on SeasonMap's comfort score (63/100).
- What is the weather like in Chengdu in September?
- In September, Chengdu averages a daily high of 25.8°C and a low of 19.7°C, with about 126.1 mm of rain over roughly 12.4 rainy days.
- What is the air quality in Chengdu in September?
- Chengdu has a mean US Air Quality Index of about 140 in September.