Planning for the weather is an important factor for making your trip to Quy Nhon a success, especially when you're splurging. The hottest months are usually June and August with an average temp of 83°F, while the coldest months are January and February with an average of 75°F. The rainiest months in Quy Nhon are November, October, December, and September, with each month seeing an average of 13 inches of rainfall.