The best time to go to Ontonagon is during the summer months, from June to August, or in the fall, particularly September and early October.For travelers looking to experience the natural beauty of the Upper Peninsula with comfortable weather, summer is ideal. Temperatures are mild, averaging in the 70s Fahrenheit, making it superb for outdoor activities like hiking in the nearby Porcupine Mountains Wilderness State Park or exploring the shores of Lake Superior. Water activities, such as kayaking and swimming, are also popular during this time.Fall is an excellent choice for those who appreciate scenic beauty and fewer crowds. The tree foliage turns into a spectacular display of reds, oranges, and yellows, especially along the scenic drives and hiking trails. While the weather can be cooler, averaging in the 50s and 60s Fahrenheit, it's still very pleasant for exploring and photography.