Planning for the weather is an important factor for making your trip to Ham Ninh a success, especially when you're splurging. The hottest months are usually May and April, with an average temperature of 29°C, while the coldest months are January and December, with an average of 27°C. The rainiest months in Ham Ninh are September, July, October and August, with each month seeing an average of 327 mm of rainfall.