Weather will likely play an important role when you plan your trip to Guigang, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually August and July, with an average temperature of 28°C, while the coldest months are January and December, with an average of 16°C. The rainiest months in Guigang are June, May, August and July, with each month seeing an average of 260 mm of rainfall.