Well, it wasn't very warm last week, but 2 of our days in Bar Harbor were very nice. We had good clear skies for our 2 days at the summit, and it was ideal for hiking both in the park and around Bah Hahbah..
We stayed at Narrows II, nothing spectacular, but great rate with Passport America and plenty of elbow room.
In Belfast we stay at The Moorings. I enjoy searching for sea glass at low tide and everything within 25 miles - wineries(Cellar Door) Ft Knox, Camden's Mt. Battie, Young's lobster pound, and downtown Belfast.
Whether it's 60or 80 degrees, you can't find many better places to be than Maine in the summah.