The best time to visit St Arnaud is during the summer months, from December to February, when the weather is warm and settled, making it ideal for outdoor activities.During this period, the days are long, and temperatures are generally pleasant, superb for exploring the stunning natural surroundings of the Nelson Lakes National Park. You'll find all the walking tracks accessible, and the lake is inviting for swimming, kayaking, and boating. It's a great time for families seeking an active holiday in nature.The shoulder seasons of autumn (March to May) and spring (September to November) also offer good conditions. In autumn, the changing colours of the trees around Lake Rotoiti are particularly beautiful, offering a more tranquil experience for couples. Spring brings fresh growth and fewer crowds, though some higher alpine tracks might still have snow.Winter (June to August) is best suited for those interested in snow sports, with the nearby Rainbow Ski Area in full swing.