If you’re hoping to get lost in the rain on your romantic getaway, check out these details about year-round temperatures in Jiaxing: The hottest months are usually July and August with an average temp of 79°F, while the coldest months are January and February with an average of 46°F. The rainiest months in Jiaxing are June, July, August, and May, with each month seeing an average of 10 inches of rainfall.