Click on a day for an hourly weather forecast
The weather in Chengdu in September is hot. The average temperatures are between 20°C and 27°C.
You can expect rain for roughly half of the month of September in Chengdu. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Chengdu in September 2025.
If you’re planning to visit Chengdu in the near future, we highly recommend that you review the 14 day weather forecast for Chengdu before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 11° / 4° | 2 | 27 | 3 | 10 mm | Bad | Chengdu in January |
| February | 14° / 6° | 1 | 26 | 1 | 11 mm | Good | Chengdu in February |
| March | 20° / 11° | 1 | 30 | 0 | 22 mm | Good | Chengdu in March |
| April | 25° / 16° | 3 | 27 | 0 | 48 mm | Perfect | Chengdu in April |
| May | 29° / 20° | 4 | 27 | 0 | 75 mm | Good | Chengdu in May |
| June | 31° / 22° | 5 | 25 | 0 | 110 mm | Good | Chengdu in June |
| July | 31° / 23° | 14 | 17 | 0 | 340 mm | Ok | Chengdu in July |
| August | 32° / 23° | 12 | 19 | 0 | 338 mm | Ok | Chengdu in August |
| September | 27° / 20° | 9 | 21 | 0 | 146 mm | Good | Chengdu in September |
| October | 22° / 16° | 4 | 27 | 0 | 53 mm | Good | Chengdu in October |
| November | 17° / 11° | 2 | 28 | 0 | 25 mm | Good | Chengdu in November |
| December | 12° / 6° | 1 | 29 | 0 | 14 mm | Ok | Chengdu in December |