Planning for the weather is a good way to make your trip to Tianchang relaxing and enjoyable, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 26°C, while the coldest months are January and February, with an average of 6°C. The rainiest months in Tianchang are July, August, June and May, with each month seeing an average of 186 mm of rainfall.