Best Time to Visit World War II Memorial

World War II Memorial is a unit of the National Park System in DC and one of the busier parks in the system, drawing about 4.0 million recreation visits in 2025. Visitation has climbed over the past decade, up roughly 7.9%, so crowds are trending heavier each year. Crowds concentrate sharply by season: May is the busiest month at about 1.4× the park's average month, while January is the calmest at roughly 0.4× — a 4-to-1 swing between high and low season. Roughly 31% of the year's visitors arrive in the three summer months of June, July and August alone, so timing a trip outside that window is the single biggest lever on how crowded the park feels. Weather swings from an average high-season warmth near 81°F in July down to about 38°F in January, with the wettest stretch in July and meaningful snowfall around February. About 6 months a year see comfortable average temperatures in the 50–80°F range, which is part of why crowd timing and weather timing don't always line up. The sweet spot is September: pleasant weather with noticeably thinner crowds (shoulder season). Visit then and you trade a little peak-season certainty for noticeably shorter lines and easier parking than the May rush. Daylight ranges from about 9.3 hours in midwinter to 14.7 hours near the summer solstice, which shapes how much ground you can cover in a day. These crowd figures are drawn from 2004–2025 of National Park Service visitor-use records, paired with 1991–2020 NOAA climate normals, and are updated as new monthly data is released.