Planning for the weather is a good way to make your trip to Wiang Pa Pao relaxing and enjoyable, especially when you're splurging. The hottest months are usually April and March, with an average temperature of 27°C, while the coldest months are January and December, with an average of 23°C. The rainiest months in Wiang Pa Pao are August, July, September and May, with each month seeing an average of 254 mm of rainfall.