Stewart Island in November

December through March delivers the warmest weather and longest days, with temperatures reaching a balmy 20°C on good days. This is peak season, so book everything months ahead and expect to pay premium prices. But here's the insider tip: late March and early April offer incredible value with fewer crowds and still-decent weather. You might catch the southern lights more easily as nights get longer. Winter (June-August) brings wild storms and short days, but accommodation costs drop by 40% and you'll have the trails mostly to yourself. The weather here changes every 20 minutes regardless of season — pack layers and waterproof everything. Spring (September-November) can be spectacular for wildflowers and bird activity, though expect mud on the hiking tracks. Look, there's no truly bad time to visit if you're prepared for Stewart Island's moody weather patterns.