If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Wenzhou: 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 11°C. The rainiest months in Wenzhou are June, August, July and May, with each month seeing an average of 270 mm of rainfall.