Planning for the weather is an important factor for making your trip to Ku Kuan a success, especially when you're splurging. The hottest months are usually July and September with an average temp of 73°F, while the coldest months are January and February with an average of 60°F. The rainiest months in Ku Kuan are August, July, June, and September, with each month seeing an average of 16 inches of rainfall.