Planning for the weather is an important factor for making your trip to Chengdu a success, especially when you’re splurging. The hottest months are usually August and July, with an average temperature of 25°C, while the coldest months are January and February, with an average of 10°C. The rainiest months in Chengdu are July, August, September and June, with each month seeing an average of 228 mm of rainfall.