Planning for the weather is an important factor for making your trip to Te Anau a success, especially when you’re splurging. The hottest months are usually January and February, with an average temperature of 9°C, while the coldest months are July and August, with an average of 2°C. The rainiest months in Te Anau are October, September, May and January, with each month seeing an average of 346 mm of rainfall.