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Acadia · September
September is the busiest time to visit Acadia — quieter than August, busier than October.
Expect peak crowds (9/10), highs near 70°F, about 12.5 hours of daylight, and 1 seasonal closure in effect.
Crowd score
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
September draws about 15% of Acadia’s yearly visitors.
Typical monthly recreation visits, averaged over the most recent three full years.
Source: NPS Visitor Use Statistics, 2023–2025
Weather
Source: NOAA 1991–2020 climate normals, Bar Harbor
What's open
Open 24 hours; Park Loop Road closed Dec 1 to mid-Apr; Cadillac reservations in season
Seasonal closures may apply:
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
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
FAQ
September rates 9/10 for crowds (Peak) at Acadia National Park — about 81% of its busiest month. Typical recreation visits: 591,629.
In September, Acadia averages a high of 70°F and a low of 51°F, with about 3.7 inches of precipitation.
Entrance to Acadia costs $35 ($35 per private vehicle, valid 7 days).
Acadia is quietest in January and February. If your dates are flexible, those months bring the thinnest crowds of the year.
In mid-September, Acadia gets about 12.5 hours of daylight, with sunrise around 5:12 AM and sunset around 5:43 PM.