Acadia National Park in September
September at Acadia National Park averages a daytime high near 71°F and an overnight low around 53°F, with about 4.2" of precipitation. Visitation runs about 2× the park's average month, which makes September a very busy month here.
- Average low
- 53°F
- Average high
- 71°F
Range across the year: 15°F to 79°F
- Precipitation
- 4.2 in
- Daylight
- 12.3 hours
Roughly 17% of the park's yearly visitors come in September: about 618,000 recreation visits in a typical year, based on National Park Service monthly counts from 1979 to 2025.
That makes September the 3rd-busiest of the park's twelve months, sitting between the August peak (2.5×) and the February low (0×).
On our Best Time to Visit score September rates 49/100 ("Fair"). Our recommended month is May: the lightest crowds of the park's good-weather months.
The daily average of about 62°F is a comfortable range for hiking and being outdoors all day. These figures are 1991–2020 NOAA climate normals from the nearest station, about 2.5 miles from the park.
Because June, July and August together draw about 56% 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 12.3 hours of daylight in September to explore — between the 8.7-hour midwinter low and the 15.3-hour summer high.
Park-wide, 2025 drew 4,079,318 recreation visits, up 3% from 3,961,661 in 2024.
Across the past decade overall visitation has risen about 21.3%, 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 | 78°F / 60°F | 2.5× Very busy | 50 Fair |
| September | 71°F / 53°F | 2.0× Very busy | 49 Fair |
| October | 59°F / 43°F | 1.7× Very busy | 37 Poor |
All twelve months at Acadia, with the best time to visit.
Things to do at Acadia in September
The National Park Service tags 82 Acadia activities for fall. Here are 8 of them. Each links to the park's own page for it.
- Hike Jordan Cliffs Loop · 3-4 hours
- Hike Precipice Loop · 2-3 hours
- Birding "with" the Champlain Society
- Explore Historic Carroll Homestead
- Hike Double Bubble Nubble Loop with Island Explorer · 4-5 hours
- Hike Jordan Pond Loop with Island Explorer Bus · 1-2 hours
- Hike Ship Harbor Trail · 30-60 minutes
- Stargazing Ocean Path
Frequently Asked Questions
September averages a daytime high near 71°F and an overnight low around 53°F at Acadia National Park, with about 4.2 inches of precipitation. These are 1991–2020 NOAA climate normals from the nearest station, about 2.5 miles from the park, so conditions inside the park can differ, especially at other elevations.
September is very busy at Acadia National Park (about 2.0× the average month). Our best-time score rates it "Fair" at 49/100. Our recommended month is May.
The busiest month is August and the quietest is February. September sits at about 2.0× the park's average, or 17% of annual visitation.
A typical September sees about 618,000 recreation visits at Acadia National Park, based on National Park Service monthly counts from 1979–2025.
Where to stay near Acadia in September
Booking a September trip to Acadia National Park? Compare hotels, cabins and vacation rentals near the park with live September availability and prices.
Top-rated places to stay near Acadia
Prices for Oct 30–Nov 1, 4 adults. Change dates on the map below.
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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.