Planning for the weather is a good way to make your trip to Ruisui relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 77°F, while the coldest months are January and February with an average of 62°F. The rainiest months in Ruisui are May, August, June, and September, with each month seeing an average of 18 inches of rainfall.