May is the wettest month of the year at 4" (102mm), but also enjoys many sunny days with average temperatures in the range of 55°F (12.8°C) to 75°F (23.9°C). It is a good idea to bring a light jacket or an umbrella to watch the National Memorial Day Parade. The sunshine increases to more than 6 hours as the daylight extends to 12 hours. Sunny May is one of the best times to visit Washington, D.C., but it is also one of the busiest, and it is better to plan early to get the best hotels.