You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, taking a look at local weather data can help you. The hottest months are usually May and June, with an average temperature of 21°C, while the coldest months are January and December, with an average of 14°C. The rainiest months in Mu Cang Chai are August, July, June and September, with each month seeing an average of 338 mm of rainfall.