If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Thuan An: The hottest months are usually June and May, with an average temperature of 29°C, while the coldest months are January and December, with an average of 22°C. The rainiest months in Thuan An are October, November, September and December, with each month seeing an average of 487 mm of rainfall.