Acadia National Park in September
Acadia National Park · crowd + weather almanac
September crowd level
busy
about 623,000 visits in a
typical September
The 3rd-busiest month of the year ·
median of 2016–2025 official NPS counts
September is the 3rd-busiest month of the year at Acadia National Park: about 623,000 recreation visits in a typical September (17% of the year's traffic, and 81% of what the peak month, August, sees). This is a busy month, though short of the summer-peak crush. Weather-wise, September days at the Acadia Np, ME station typically top out around 71°F with nights near 53°F, and about 4.2 inches of precipitation falls over the month.
- Typical September: 623,389 recreation visits (median 2016–2025); the range across those years ran 500,320 (2020) to 697,292 (2022).
- Busier than 9 of the other 11 months.
- 1991–2020 September normals at Acadia Np, ME: high 71°F, low 53°F, 4.22 in precipitation.
- Similar daytime temperatures, thinner crowds: May typically runs 64°F days with about 54% fewer visits (285,000 vs 623,000).
September weather (1991–2020 normals)
| Typical daytime high | 71°F |
|---|---|
| Typical overnight low | 53°F |
| Precipitation (monthly normal) | 4.22 in |
| Measured at | Acadia Np, ME (USC00170100), 2.5 mi from the park reference point, elev. 470 ft |
Every month at Acadia
| Month | Typical visits | Crowds | High / Low | Precip |
|---|---|---|---|---|
| January | 14,200 | quietest stretch | 32°F / 15°F | 4.5 in |
| February | 13,765 | quietest stretch | 35°F / 18°F | 3.8 in |
| March | 25,848 | quietest stretch | 42°F / 25°F | 4.9 in |
| April | 94,682 | quietest stretch | 53°F / 35°F | 5.2 in |
| May | 284,967 | moderate | 64°F / 45°F | 4.5 in |
| June | 532,849 | busy | 74°F / 54°F | 4.3 in |
| July | 763,560 | busiest stretch | 79°F / 60°F | 3.3 in |
| August | 770,757 | busiest stretch | 78°F / 60°F | 3.5 in |
| September | 623,389 | busy | 71°F / 53°F | 4.2 in |
| October | 514,620 | busy | 58°F / 43°F | 5.9 in |
| November | 67,496 | quietest stretch | 48°F / 33°F | 5.9 in |
| December | 14,246 | quietest stretch | 38°F / 22°F | 5.7 in |