Planning for the weather is a good way to make your trip to Dong Hoi relaxing and enjoyable, especially when you're splurging. The hottest months are usually June and July, with an average temperature of 29°C, while the coldest months are January and February, with an average of 21°C. The rainiest months in Dong Hoi are October, September, November and December, with each month seeing an average of 474 mm of rainfall.