Planning for the weather is a good way to make your trip to Kaeng Krachan relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and May, with an average temperature of 29°C, while the coldest months are January and December, with an average of 26°C. The rainiest months in Kaeng Krachan are September, October, July and August, with each month seeing an average of 205 mm of rainfall.