If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Shanghang: The hottest months are usually July and August, 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 Shanghang are June, May, August and April, with each month seeing an average of 245 mm of rainfall.