Weather in Chengdu in September 2025
Average weather
Average temperature in Chengdu in September
The expected average maximum temperature in September is +28°C with a maximum of +33°C and a minimum of +19°C.
The average maximum temperature goes down 21% by the end of the month, compared with the beginning of the month, from +27°C to +24°C.
Is Chengdu warm or cold in September?
Chengdu is typically warm in September.
Maximum temperatures go down compared to the previous month from +30°C to +25°C. The minimum temperature also goes down from +23°C to +19°C.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Chengdu:
Climate in Chengdu in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +30°C | +25°C | +21°C | ||||
| Min. temperature | ||||||
| +16°C | +13°C | +3°C | ||||
| Max. temperature | ||||||
| +42°C | +35°C | +32°C | ||||
| Rainfall | ||||||
| 296 mm | 138 mm | 48 mm | ||||
| Wind | ||||||
| 1 m/s | 1 m/s | 1 m/s | ||||
| Humidity | ||||||
| 81% | 81% | 81% | ||||
| Air pressure | ||||||
| 1004 HPa | 1011 HPa | 1018 HPa | ||||
| Sunny days | ||||||
| 2 | 3 | 2 | ||||
| Cloudy days | ||||||
| 3 | 6 | 11 | ||||
| Rainy days | ||||||
| 24 | 21 | 17 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +30°C in the day, the average maximum temperature lowers to +25°C. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 296 mm to 138 mm. Humidity levels don’t change as the month goes on, averaging around 81%. The average wind speed doesn’t change much during September, staying around 1 m/s. The good news is there are likely to be more sunny days in September, from 2 to 3.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Chengdu is gradually increasing during September, going from 1 m/s to 1 m/s over the course of the month.
Rain
How was the weather last September in Chengdu?
Climate Change over Years
The climate in Chengdu in September has not changed much over the last 43 years.
The average temperature was the lowest in 1984 (+20°C) and the highest in 2020 (+23°C). The driest year was 2006 with only 736 mm of rainfall, and the wettest year was 1990 with 1678 mm.
FAQ
Is September a good time to visit Chengdu?
Can you sunbathe in Chengdu in September?
Is Chengdu rainy in September?
Is it sunny in Chengdu in September?
Other cities in China
Monthly weather in Chengdu
Source of the data
For this page, we’ve looked at the typical weather in Chengdu, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.