How Crowded Is Castillo de San Marcos National Monument in July?

July runs about 1.2× Castillo de San Marcos National Monument's average month, which makes it a busy month here — roughly 10% of the park's yearly visitors come in July.

In a typical July the park sees about 62,000 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes July the 3rd-busiest of the park's twelve months, sitting between the March peak (1.5×) and the September low (0.6×).

On our Best Time to Visit score July rates 48/100 ("Fair"), versus the top-rated October at 77/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical July weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 91°F and an overnight low around 74°F, with about 4.9" of precipitation.

That average of about 82°F is warm enough that midday heat is worth planning around.

July falls inside the park's busiest stretch: June, July and August together pull about 24% of the year's visitors, so a visit this month means sharing the park with the peak-season crowd.

You'll have about 13.7 hours of daylight in July to explore — near the year-round maximum.

Park-wide, 2025 drew 598,070 recreation visits, up 3.1% from 579,825 in 2024.

Across the past decade overall visitation has eased about 13.4%, so July may feel a touch quieter than it once did.