How Crowded Is Dry Tortugas National Park in September?

September runs about 0.8× Dry Tortugas National Park's average month, which makes it a quiet month here — roughly 7% of the park's yearly visitors come in September.

In a typical September the park sees roughly 4,900 recreation visits, based on National Park Service monthly counts from 1979 to 2025.

That makes September the 11th-busiest of the park's twelve months, sitting between the June peak (1.2×) and the October low (0.7×).

On our Best Time to Visit score September rates 54/100 ("Fair"), versus the top-rated February at 65/100 — pleasant weather with noticeably thinner crowds (shoulder season).

Typical September weather, from 1991–2020 NOAA climate normals at the nearest station, averages a daytime high near 89°F and an overnight low around 78°F, with about 7.2" of precipitation.

That average of about 83°F is warm enough that midday heat is worth planning around.

Because June, July and August together draw about 28% of annual visitors, choosing September instead steps outside that summer crush — the single biggest lever on how crowded the park feels.

You'll have about 12.1 hours of daylight in September to explore — between the 10.5-hour midwinter low and the 13.5-hour summer high.

Park-wide, 2025 drew 89,355 recreation visits, up 5.3% from 84,873 in 2024.

Across the past decade overall visitation has risen about 34.7%, so a September visit is likely to feel busier than it did a few years ago.