If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Ganh Dau: The hottest months are usually May and April, with an average temperature of 29°C, while the coldest months are January and December, with an average of 27°C. The rainiest months in Ganh Dau are September, July, October and August, with each month seeing an average of 327 mm of rainfall.