Planning for the weather is a good way to make your trip to Dĩ An relaxing and enjoyable, especially when you’re splurging. The hottest months are usually March 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 Dĩ An are September, July, October and August, with each month seeing an average of 324 mm of rainfall.