Taking into account the local weather in Manapouri is an important factor for planning your visit, especially if you plan to spend your trip poolside. The hottest months are usually January and February with an average temp of 49°F, while the coldest months are July and August with an average of 36°F. The rainiest months in Manapouri are October, September, May, and January, with each month seeing an average of 14 inches of rainfall.