Planning for the weather is a good way to make your trip to Ruatapu relaxing and enjoyable, especially when you’re splurging. The hottest months are usually February and January with an average temp of 60°F, while the coldest months are July and August with an average of 48°F. The rainiest months in Ruatapu are May, December, October, and September, with each month seeing an average of 12 inches of rainfall.