I did Northern Maine 6 years ago in Late August and had some annoying mosquitoes at about half the campsites. Temps were generally warm, but didn't see alot of elevation. Is it about the same in the South of Maine? Bringing a small bottle of 25% DEET and pretreating everything with permethrin. Clothing: no puffy, but long underwear, beanie, windshirt, rain jacket, and a buff.