Weather will likely play an important role when you plan your trip to Heyuan, 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 27°C, while the coldest months are January and December, with an average of 15°C. The rainiest months in Heyuan are June, May, August and July, with each month seeing an average of 296 mm of rainfall.