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 Taian: The hottest months are usually August and September, with an average temperature of 26°C, while the coldest months are January and February, with an average of 18°C. The rainiest months in Taian are August, June, May and July, with each month seeing an average of 354 mm of rainfall.