Taking into account the local weather in Thai Nguyen is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually June and July with an average temp of 82°F, while the coldest months are January and December with an average of 65°F. The rainiest months in Thai Nguyen are August, June, July, and May, with each month seeing an average of 15 inches of rainfall.