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 Hechi: The hottest months are usually August and July, with an average temperature of 25°C, while the coldest months are January and December, with an average of 12°C. The rainiest months in Hechi are June, May, July and August, with each month seeing an average of 323 mm of rainfall.