Acadia National Park in September
In September, Acadia National Park averages a high of 71°F and a low of 53°F, with 4.2 inches of precipitation (rain plus melted snow). About 650,000 people visit, the 3rd busiest of 12 (very busy). Days are 12 hours 27 minutes long.
- Quiet
- Moderate
- Busy
- Very busy
- Few or no visits (may be closed)
- Best months
- High / low
- 71° / 53°F
- Precipitation
- 4.2in
- Snow
- –in
- Daylight
- 12h 27m
- Visitors
- 650,000
- Crowds
- Very busy
September is one of the best months to visit: mild weather with very busy crowds.
Weather 1991–2020 averages at Acadia NP, ME, 2.6 miles from the park's center, 470 ft. Visitors National Park Service recreation visits, average of 2023–2025. Updated .
Other parks in September
| Park | High / low °F | Crowds | Weather |
|---|---|---|---|
| Cape Cod National Seashore | 71° / 58° | Busy | Mild |
| Boston National Historical Park | 73° / 58° | Busy | Mild |
| Stonewall National Monument | 76° / 62° | Few or no visits | Mild, wet |
| Gateway National Recreation Area | 76° / 61° | Busy | Mild |
| Castle Clinton National Monument | 76° / 62° | Busy | Mild, wet |
Closures, reservations and alerts: Acadia National Park on nps.gov
All twelve months at Acadia · National parks to visit in September