Planning for the weather is a good way to make your trip to Bandarban relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and May, with an average temperature of 28°C, while the coldest months are January and December, with an average of 23°C. The rainiest months in Bandarban are July, August, June and September, with each month seeing an average of 551 mm of rainfall.