Planning for the weather is an important factor for making your trip to Nam Nao a success, especially when you're splurging. The hottest months are usually April and March, with an average temperature of 28°C, while the coldest months are December and January, with an average of 24°C. The rainiest months in Nam Nao are August, July, May and September, with each month seeing an average of 450 mm of rainfall.