The best time to go to Greenville, Maine, is during the summer months, from June to August, for pleasant weather and outdoor activities, or in the fall, from late September to mid-October, for stunning foliage.For those seeking warm weather and a wide range of outdoor adventures, summer is ideal. The average daytime temperatures are comfortable, typically in the 70s Fahrenheit, superb for exploring Moosehead Lake, hiking nearby trails like those on Mount Kineo, or enjoying boat tours. This period is particularly good for families looking for activities like swimming, fishing, and wildlife viewing.Couples looking for a picturesque and memorable getaway will find the fall to be an exceptional time to visit. The surrounding forests transform into a vibrant display of reds, oranges, and golds, creating breathtaking scenery. While temperatures are cooler, generally in the 50s and 60s Fahrenheit, it's superb for scenic drives, photography, and enjoying the crisp air.