Planning for the weather is an important factor for making your trip to Fangchenggang a success, especially when you're splurging. The hottest months are usually July and August, with an average temperature of 28°C, while the coldest months are January and December, with an average of 17°C. The rainiest months in Fangchenggang are August, July, June and September, with each month seeing an average of 333 mm of rainfall.