Weather will likely play an important role when you plan your trip to Weinan, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and June with an average temp of 68°F, while the coldest months are January and December with an average of 34°F. The rainiest months in Weinan are July, August, September, and June, with each month seeing an average of 8 inches of rainfall.