Weather is probably a major factor when you plan your trip to Guyu, but bear 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 temperature of 26°C, while the coldest months are January and December, with an average of 9°C. The rainiest months in Guyu are June, August, May and July, with each month seeing an average of 199 mm of rainfall.