Planning for the weather is a good way to make your trip to Ninh Hai relaxing and enjoyable, especially when you’re splurging. The hottest months are usually June and May with an average temp of 83°F, while the coldest months are January and February with an average of 76°F. The rainiest months in Ninh Hai are November, October, September, and May, with each month seeing an average of 10 inches of rainfall.