Weather will likely play an important role when you plan your trip to Jieyang, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August with an average temp of 81°F, while the coldest months are January and December with an average of 61°F. The rainiest months in Jieyang are June, August, July, and May, with each month seeing an average of 10 inches of rainfall.