Planning for the weather is a good way to make your trip to Lang Suan relaxing and enjoyable, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 28°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Lang Suan are September, July, October and August, with each month seeing an average of 414 mm of rainfall.