Weather is probably a major factor when you plan your trip to Taumarunui, 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 Taumarunui are September, October, July, and May, with each month seeing an average of 8 inches of rainfall.