September is a tough month at Dry Tortugas — it ranks 12th of the twelve here. Expect about 33% fewer visitors than May, the park's peak — 5,755 visits on average. Days run around 89°F by afternoon and 78°F at night, with 12.3 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Tough | 5,755 | −33% | 89°F | 78°F | — | 12.3 h |
| February (best) | Good | 6,443 | −25% | 76°F | 66°F | — | 11.3 h |
| May (peak crowds) | Good | 8,643 | peak | 86°F | 75°F | — | 13.3 h |
Weather figures are for Garden Key, the island Fort Jefferson stands on — the Dry Tortugas station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is September a good time to visit Dry Tortugas?
It is the tough season — doable with preparation, but the numbers say most people should pick another month. September ranks 12 of 12 at Dry Tortugas on crowds, weather, daylight, and access together.
How crowded is Dry Tortugas in September?
About 5,755 recreation visits on average — 33% below May, the park's peak.
How warm is Dry Tortugas in September?
Average highs around 89°F and lows around 78°F at the Dry Tortugas station.
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