Planning for the weather is an important factor for making your trip to Waihuangshi a success, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 26°C, while the coldest months are January and December, with an average of 7°C. The rainiest months in Waihuangshi are June, July, May and August, with each month seeing an average of 229 mm of rainfall.