Weather will likely play an important role when you plan your trip to Ohakune, and keep in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually January and February with an average temp of 45°F, while the coldest months are July and August with an average of 31°F. The rainiest months in Ohakune are September, October, July, and May, with each month seeing an average of 8 inches of rainfall.