Gulf Islands National Seashore in September
September at Gulf Islands National Seashore averages a daytime high near 86°F and an overnight low around 70°F, with about 6.8" of precipitation. Visitation runs about 1× the park's average month, which makes September an average month here.
- Average low
- 70°F
- Average high
- 86°F
Range across the year: 42°F to 89°F
- Precipitation
- 6.8 in
- Daylight
- 12.2 hours
Roughly 8% of the park's yearly visitors come in September: about 467,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 6th-busiest of the park's twelve months, sitting between the July peak (1.4×) and the January low (0.6×).
On our Best Time to Visit score September rates 51/100 ("Fair"). Our recommended month is November: pleasant weather with noticeably thinner crowds (shoulder season).
The daily average of about 78°F is warm enough that midday heat is worth planning around. These figures are 1991–2020 NOAA climate normals from the nearest station, about 5.5 miles from the park.
Because June, July and August together draw about 33% 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 12.2 hours of daylight in September to explore — between the 10.1-hour midwinter low and the 13.9-hour summer high.
Park-wide, 2025 drew 7,576,923 recreation visits, down 2.9% from 7,801,176 in 2024.
Across the past decade overall visitation has risen about 54.2%, so a September visit is likely to feel busier than it did a few years ago.
How September compares with the months around it
| Month | Avg high / low | Crowds | Best-time score |
|---|---|---|---|
| August | 89°F / 73°F | 1.2× Busy | 35 Poor |
| September | 86°F / 70°F | 1.0× Average | 51 Fair |
| October | 79°F / 60°F | 0.8× Quiet | 73 Good |
All twelve months at Gulf Islands, with the best time to visit.
Things to do at Gulf Islands in September
The National Park Service tags 10 Gulf Islands activities for fall. Here are 8 of them. Each links to the park's own page for it.
- Go Waterfowl Hunting · 1-4 hours
- Fishing at Gulf Islands · 1-6 hours
- Florida National Scenic Trail · 2-5 days
- Get Your Passport Stamped at Gulf Islands · 5-15 minutes
- Go for a Hike at Gulf Islands · 30-120 minutes
- Ride your Bike at Gulf Islands · 30-180 minutes
- View the Night Sky at Gulf Islands · 30-90 minutes
- Visit the Gulf Islands Park Store · 5-60 minutes
Frequently Asked Questions
September averages a daytime high near 86°F and an overnight low around 70°F at Gulf Islands National Seashore, with about 6.8 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 5.5 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is average at Gulf Islands National Seashore (about 1.0× the average month). Our best-time score rates it "Fair" at 51/100. Our recommended month is November.
The busiest month is July and the quietest is January. September sits at about 1.0× the park's average, or 8% of annual visitation.
A typical September sees about 467,000 recreation visits at Gulf Islands National Seashore, based on National Park Service monthly counts from 1979–2025.
Where to stay near Gulf Islands in September
Booking a September trip to Gulf Islands National Seashore? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Gulf Islands
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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Visiting Gulf Islands in September?
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See the full ranking of the best national parks to visit in September.
Source: National Park Service Visitor Use Statistics (1979–2025), NOAA NCEI Climate Normals 1991–2020. Updated 2026-10-11.