Planning for the weather is an important factor for making your trip to Mangarakau a success, especially when you’re splurging. The hottest months are usually February and January with an average temp of 63°F, while the coldest months are July and August with an average of 53°F. The rainiest months in Mangarakau are May, June, August, and July, with each month seeing an average of 8 inches of rainfall.