Dry Tortugas in September: Crowds, Weather & What to Pack
Shoulder · VisitWhen score 46/100 · #12 of 12 months
September is a solid shoulder-season month to visit Dry Tortugas National Park: crowds run 67% of the May peak (5,755 average visits). Weather: highs average 89°F and lows 78°F, with 7.2″ of precipitation and 12.3 hours of daylight. Computed from NPS and NOAA data.
Bring for Dry Tortugas in September
- Sun protection and 2L+ water per personSee it on AmazonWhy: highs average 89°F.
- Rain shell + pack coverSee it on AmazonWhy: 7.2″ of precipitation is normal this month.
- Waterproof boots — plus navigation and a basic first-aid kitSee it on AmazonWhy: 7.2″ of rain is normal this month.
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Crowds in September
Dry Tortugas averages 5,755 recreation visits in September — 67% of what May, the peak month, draws — the second-quietest month of the year. Plan lodging and entries with that in mind.
Weather & daylight
Expect warm days (highs average 89°F), and even nights stay hot (lows average 78°F). This is one of the wetter months (7.2″ of precipitation on average). Mid-month daylight runs 12.3 hours.
NOAA 1991–2020 monthly normals, station DRY TORTUGAS, FL US (0 mi from park coordinates, 3 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of September.
What to pack for Dry Tortugas in September
Computed from the month's weather normals above — not a generic list.
- Sun protection and 2L+ water per person — highs average 89°F
- Rain shell + pack cover — 7.2″ of precipitation is normal this month
- Waterproof boots — plus navigation and a basic first-aid kit — 7.2″ of rain is normal this month
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Looking for a better window? The computed best months for Dry Tortugas are January and February.
Also at their best in September
Other parks whose computed September verdict is a best window — same NPS × NOAA formula:
- Wrangell–St. Elias in September — 25% of peak crowds, highs 56°F, score 84/100
- Guadalupe Mountains in September — 35% of peak crowds, highs 80°F, score 81/100
- Gateway Arch in September — 29% of peak crowds, highs 81°F, score 80/100
- Isle Royale in September — 39% of peak crowds, highs 65°F, score 79/100
Common questions
Is Dry Tortugas crowded in September?
Moderately: September runs 67% of the May peak, averaging 5,755 visits (NPS, 2021–2025).
What is the weather like in Dry Tortugas in September?
Average highs of 89°F, lows of 78°F, 7.2″ of precipitation (NOAA 1991–2020 normals, DRY TORTUGAS, FL US station).
What should I pack for Dry Tortugas in September?
Sun protection and 2L+ water per person; Rain shell + pack cover; Waterproof boots — plus navigation and a basic first-aid kit — the full weather-computed list is on this page.
See also: the best national parks to visit in September · Last verified 2026-09-24