Acadia in August: Crowds, Weather & What to Pack
Peak crowds · VisitWhen score 60/100 · #5 of 12 months
August is peak season — expect the year's biggest crowds at Acadia National Park: crowds run 100% of the August peak (798,914 average visits). Weather: highs average 78°F and lows 60°F, with 3.5″ of precipitation and 14.1 hours of daylight. Computed from NPS and NOAA data.
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Bring for Acadia in August
- Packable rain jacketSee it on AmazonWhy: 3.5″ of precipitation is normal this month.
- Sturdy, broken-in hiking bootsSee it on AmazonWhy: every park, every month.
- Water bottles for the daySee it on AmazonWhy: hydration is one of the NPS Ten Essentials.
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Acadia in August: what the park service says
Planning an August sunrise on Cadillac Mountain? Acadia releases its Cadillac Summit Road reservations in two batches at 10 a.m. Eastern: 30 percent of them 90 days before the date, and the other 70 percent just two days before. So if the early batch is gone, try again two days ahead. A sunrise slot gives a 90-minute window to drive up and can be used once per vehicle in seven days; the reservation is per car, not per person, and costs $6.
Source: NPS, checked 2026-11-05.
Crowds in August
August is Acadia's busiest month — an average of 798,914 recreation visits (2021–2025), the park's crowd peak. Trailheads and parking fill accordingly — book early and start days at dawn.
Weather & daylight
Days are mild (highs average 78°F), and nights stay mild (lows average 60°F). Average precipitation is 3.5″ for the month. Mid-month daylight runs 14.1 hours.
NOAA 1991–2020 monthly normals, station ACADIA NP, ME US (2 mi from park coordinates, 470 ft elevation) — conditions vary inside the park, especially with elevation. Daylight computed for the 15th of August.
What to pack for Acadia in August
Computed from the month's weather normals above — not a generic list.
- Packable rain jacket — 3.5″ of precipitation is normal this month
- Sturdy broken-in footwear, navigation and a basic first-aid kit — every park, every month
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If your dates are flexible, consider shifting: The computed best months for Acadia are May and June.
Also at their best in August
Other parks whose computed August verdict is a best window — same NPS × NOAA formula:
- Guadalupe Mountains in August — 28% of peak crowds, highs 84°F, score 80/100
- Lassen Volcanic in August — 56% of peak crowds, highs 78°F, score 77/100
- Bryce Canyon in August — 81% of peak crowds, highs 78°F, score 68/100
- Redwood in August — 85% of peak crowds, highs 66°F, score 67/100
Common questions
Is Acadia crowded in August?
Yes — August runs 100% of Acadia's peak, averaging 798,914 recreation visits (NPS, 2021–2025). See every month at Acadia.
What is the weather like in Acadia in August?
Average highs of 78°F, lows of 60°F, 3.5″ of precipitation (NOAA 1991–2020 normals, ACADIA NP, ME US station). Compare it with other national parks in August.
What should I pack for Acadia in August?
Packable rain jacket; Sturdy broken-in footwear, navigation and a basic first-aid kit — the full weather-computed list is on this page. Going in September instead? Acadia in September has its own list.
See also: the best national parks to visit in August · Last verified 2026-09-24