The best time to visit Prien am Chiemsee is during the warmer months, from late spring (May) through early autumn (September), when the weather is ideal for enjoying the lake and outdoor activities.May and June offer pleasant temperatures, fewer crowds than mid-summer, and the landscape is lush and green. This period is excellent for couples who enjoy hiking or cycling around the lake, as the trails are less busy, and the weather is comfortable for longer excursions. You can easily catch a boat from the Prien/Stock harbour to explore Herrenchiemsee Palace without the peak season rush.July and August are the warmest months, superb for swimming in Lake Chiemsee, sailing, or simply relaxing by the water. Families often find these months ideal, as the lake provides plenty of opportunities for children to play and for everyone to enjoy water sports. The Chiemsee-Bahn, a historic steam train, offers a delightful ride from Prien station to the harbour, which is a fun activity for all ages.September is also a lovely time to visit, with mild temperatures and the start of autumn colours.