Published July 19, 2013 4 min read. Usually in August of each year, it hosts the San Juan Summer Arts Festival with local art, live music, and lots of delicious local food and drinks on the menu. Average high temperatures range from the low 70s to the low 80s, mostly in July and August. /* Coolweather 728x90 top banner */ Topics that could potentially impact your safety and wellbeingyou should consult professionals and never rely on the information you find online. Weather can change over the course of minutes, hours, days or weeks. Once the autumn months arrive, the slightly cooler air offers relief from the humid days of summer. Sunrise Manor has an average of 296 sunny days each year. The mean annual temperatures in Nevada Fairbanks is onlya short 1-hour flight from Anchorageor you could take a beautiful scenic drive approximately 6 hours. The closest airport to Boundary Waters is in Duluth, Minnesota, which is about 2 hours south of the main entry point. That's still warm compared with the coldest temperature recorded in the state, though: -63 degrees in 1933.