You'll likely spend much of your trip indoors, but if you want to see more of the area, taking a look at local weather data can help you. The hottest months are usually August and July with an average temp of 82°F, while the coldest months are January and December with an average of 50°F. The rainiest months in Changsha are June, May, April, and July, with each month seeing an average of 11 inches of rainfall.