Climate averages 1991–2020
Chengdu weather
in September.
A warm, wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Chengdu: daytime highs average 25.5°C and nights cool to about 19.3°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 134 mm of rain on roughly 13 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 23 min on an average September day.
The nearest other city in this atlas is Deyang (60 km away). In September its highs average 25.0°C, 0.5°C cooler than Chengdu, with 133 mm of rain.
Among the 884 cities listed in China, Chengdu ranks joint 565th of 884 for the warmest September highs and 714th of 884 for the driest September (rainfall, lowest first). The mean September high of those 884 cities is 25.7°C; Chengdu is 0.2°C cooler than that mean.
From September to October, average highs fall by 4.9°C to 20.6°C, and monthly rainfall falls from 134 mm to 40 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Chengdu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.8°C3.1°C | 3.1°C | 3.4 | 1.0 | 10.410 h |
| February | 12.4°C5.1°C | 5.1°C | 6.9 | 2.1 | 11.111 h |
| March | 17.3°C9.0°C | 9.0°C | 19 | 5.5 | 12.012 h |
| April | 23.2°C13.8°C | 13.8°C | 43 | 7.8 | 12.913 h |
| May | 27.1°C18.0°C | 18.0°C | 66 | 9.7 | 13.714 h |
| June | 29.1°C21.1°C | 21.1°C | 128 | 11.6 | 14.114 h |
| July | 30.0°C22.7°C | 22.7°C | 292 | 19.7 | 13.914 h |
| August | 29.5°C22.4°C | 22.4°C | 290 | 19.7 | 13.313 h |
| September, selected | 25.5°C19.3°C | 19.3°C | 134 | 12.7 | 12.412 h |
| October | 20.6°C15.0°C | 15.0°C | 40 | 8.5 | 11.411 h |
| November | 16.2°C10.0°C | 10.0°C | 16 | 4.3 | 10.611 h |
| December | 11.1°C4.6°C | 4.6°C | 4.1 | 1.3 | 10.210 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Deyang in SeptemberChina · 60 kmHigh 25.0°C · Low 19.0°C · 133 mm rain
- Meishan in SeptemberChina · 73 kmHigh 25.7°C · Low 19.7°C · 120 mm rain
- Mianzhu, Deyang, Sichuan in SeptemberChina · 76 kmHigh 23.1°C · Low 18.4°C · 152 mm rain
- Luojiang in SeptemberChina · 82 kmHigh 24.6°C · Low 18.7°C · 133 mm rain
- Ziyang in SeptemberChina · 82 kmHigh 26.1°C · Low 19.8°C · 116 mm rain
- Mianyang in SeptemberChina · 107 kmHigh 25.1°C · Low 18.8°C · 142 mm rain
- Leshan in SeptemberChina · 126 kmHigh 25.6°C · Low 20.0°C · 128 mm rain
- Ya'an in SeptemberChina · 127 kmHigh 23.4°C · Low 18.8°C · 197 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Chengdu) is explained once on the Chengdu year overview and on the Sources, method and limits page.