September is a good month at Acadia — it ranks 6th of the twelve here. Expect about 17% fewer visitors than August, the park's peak — 662,737 visits on average. Days run around 71°F by afternoon and 53°F at night, with 12.4 hours of daylight.
September against the park's best
| Month | Verdict | Avg. visits | vs. peak | High | Low | Snow | Daylight |
|---|---|---|---|---|---|---|---|
| September (this page) | Good | 662,737 | −17% | 71°F | 53°F | — | 12.4 h |
| April (best) | Excellent | 101,703 | −87% | 53°F | 35°F | — | 13.4 h |
| August (peak crowds) | Good | 798,914 | peak | 78°F | 60°F | — | 14 h |
Weather figures are for the Bar Harbor area — the Acadia NP station. Visits are 2021–2025 averages; climate normals cover 1991–2020. Conditions vary across the park; check current status before you go.
Common questions
Is September a good time to visit Acadia?
Yes — a solid month, if not the very best. September ranks 6 of 12 at Acadia on crowds, weather, daylight, and access together.
How crowded is Acadia in September?
About 662,737 recreation visits on average — 17% below August, the park's peak.
How warm is Acadia in September?
Average highs around 71°F and lows around 53°F at the Acadia NP station.
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