Planning for the weather is an important factor for making your trip to Vung Tau a success, especially when you’re splurging. The hottest months are usually May and April with an average temp of 83°F, while the coldest months are January and February with an average of 80°F. The rainiest months in Vung Tau are September, October, July, and August, with each month seeing an average of 14 inches of rainfall.