If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Luong Son: The hottest months are usually June and July, with an average temperature of 28°C, while the coldest months are January and December, with an average of 19°C. The rainiest months in Luong Son are August, July, September and June, with each month seeing an average of 317 mm of rainfall.