Summer starts in June in Washington, D.C., and it is hot and humid. It is an excellent time for paddle boating or kayaking on the Potomac River and admiring the various memorials while moving through the water. Daily average temperatures rise to a warm 84°F (28.9°C), and numerous outdoor activities beckon the tourists. Heat is not an issue in air-conditioned places like the Smithsonian Air and Space Museum or the Library of Congress. Hop into a restaurant for well-made food, drink, and a break from the sweltering heat.