Acadia · September
Acadia in September
September is the busiest time to visit Acadia — quieter than August, busier than October.
Crowd score
How busy it gets
The park's busiest time. Reservations, early starts, and patience recommended.
About 81% of this park's busiest month.
Source: NPS Visitor Use Statistics, 2023–2025
Data: NPS visitation 2023–2025 · crowd scores computed Jul 2026 · alerts checked Jul 10, 2026. How this is calculated →
Computed from federal data · Methodology by Sharon Ben-Moshe
Visitation
Typical September visits vs. the year
Typical monthly recreation visits, averaged over the most recent three full years.
Source: NPS Visitor Use Statistics, 2023–2025
Weather
September weather
- Avg high
- 70°F
- Avg low
- 51°F
- Precipitation
- 3.7"
- Sunrise
- 5:12 AM
- Sunset
- 5:43 PM
- Daylight
- 12.5h
Source: NOAA 1991–2020 climate normals, Bar Harbor
What's open
Acadia in September: access
Open 24 hours; Park Loop Road closed Dec 1 to mid-Apr; Cadillac reservations in season
Seasonal closures may apply:
- Park Closure
Several Trails Close For Peregrine Falcon Nesting Season
Effective March 1, areas including Jordan Cliffs Trail, Penobscot East Trail, Precipice Trail, and Valley Cove Trail are closed to protect nesting peregrine falcons. The parking lot for the Precipice Trail is also closed. Rangers strictly enforce closures.
Details on nps.gov →
Source: NPS Data API
Conditions
Current alerts
- Park Closure
Several Trails Close For Peregrine Falcon Nesting Season
Effective March 1, areas including Jordan Cliffs Trail, Penobscot East Trail, Precipice Trail, and Valley Cove Trail are closed to protect nesting peregrine falcons. The parking lot for the Precipice Trail is also closed. Rangers strictly enforce closures.
Details on nps.gov →
Source: NPS Data API
Context
Acadia crowds across the year
FAQ
Acadia in September
How busy is Acadia in September?
September rates 9/10 for crowds (Peak) at Acadia National Park — about 81% of its busiest month. Typical recreation visits: 591,629.
What is the weather like at Acadia in September?
In September, Acadia averages a high of 70°F and a low of 51°F, with about 3.7 inches of precipitation.