If you're hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Chishui: The hottest months are usually July and August, with an average temperature of 24°C, while the coldest months are January and December, with an average of 9°C. The rainiest months in Chishui are July, June, August and May, with each month seeing an average of 201 mm of rainfall.