The best time to visit Winthrop, Maine, is during the summer months, specifically from June to August, when the weather is warm and conducive to outdoor activities.During this period, average temperatures range from the mid-60s to high 70s Fahrenheit, making it ideal for enjoying Cobbosseecontee Lake and the surrounding natural areas. This is when all local businesses, including seasonal restaurants and attractions, are fully operational, providing the most complete experience. Many travelers choose this time for lake activities, hiking, and exploring the local shops and eateries.Fall, from September to October, offers a visually stunning experience with vibrant foliage. While the weather cools, it's still pleasant for scenic drives and enjoying the autumn colors around the lake.