Planning for the weather is an important factor for making your trip to Hoa Hai a success, especially when you’re splurging. The hottest months are usually July and August, with an average temperature of 29°C, while the coldest months are January and December, with an average of 23°C. The rainiest months in Hoa Hai are September, August, June and October, with each month seeing an average of 225 mm of rainfall.