You'll likely spend much of your trip indoors, but if you're planning to venture beyond the casino, looking at local weather trends is a good idea. The hottest months are usually April and May, with an average temperature of 30°C, while the coldest months are December and January, with an average of 28°C. The rainiest months in Ban Bang Yai are September, October, July and August, with each month seeing an average of 187 mm of rainfall.