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 Weinan: The hottest months are usually July and June, with an average temperature of 20°C, while the coldest months are January and December, with an average of 1°C. The rainiest months in Weinan are July, August, September and June, with each month seeing an average of 191 mm of rainfall.