July is the hottest month of the year, with peak temperatures of 88°F (31.1°C). Brilliant sunshine lasts 9.4 hours daily; avoid the scorching mid-day sun or take adequate protection with the sun's ultraviolet index shooting to a dangerous 9. Rain with thundershowers is frequent during the summer, but light enough to enjoy fun events like the Independence Day celebrations. The bicycle-friendly tracks around the Potomac River are a fun way for tourists to explore Washington, D.C. during the summer.