Weather on September 20 at Acadia
Acadia National Park
Based on 53 years of data from Bar Harbor, ME
Planning Your Visit
September 20th in Acadia National Park (via Bar Harbor, ME) typically brings mild fall weather, with average highs around 67°F and lows near 49°F. Over 53 years of records, the warmest September 20th was in 1985 (70°F average), while the coldest was 1993 (47°F) — a 23°F range across recorded history. Rain or other precipitation has occurred on about 26% of September 20th dates historically, with the wettest September 20th recording 5.21" of rain. The last decade has been 3.3°F cooler on this date compared to 20-30 years ago.
The last decade has been 3.3°F cooler on this date compared to 20-30 years ago.
Planning for September 20th in Acadia? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 66°F | 43°F | -- | -- |
| 2024 | 66°F | 57°F | -- | -- |
| 2023 | 73°F | 52°F | -- | -- |
| 2022 | 56°F | 50°F | -- | -- |
| 2021 | 69°F | 49°F | -- | -- |
| 2020 | 59°F | 38°F | -- | -- |
| 2019 | 76°F | 49°F | -- | -- |
| 2018 | 60°F | 49°F | -- | -- |
| 2017 | 72°F | 63°F | -- | -- |
| 2016 | 74°F | 60°F | -- | -- |
| 2015 | 69°F | 50°F | -- | -- |
| 2014 | 61°F | 43°F | -- | -- |
| 2013 | 75°F | 55°F | -- | -- |
| 2012 | 65°F | 43°F | 0" | -- |
| 2011 | 63°F | 47°F | 0.03" | -- |
| 2010 | 65°F | 49°F | 0" | 0" |
| 2009 | 64°F | 39°F | 0" | 0" |
| 2008 | 60°F | 42°F | 0" | 0" |
| 2007 | 70°F | 54°F | 0" | 0" |
| 2006 | 68°F | 56°F | 1.24" | 0" |
| 2005 | 71°F | 60°F | 0.03" | 0" |
| 2004 | 64°F | 42°F | 0.05" | 0" |
| 2003 | 67°F | 62°F | -- | -- |
| 2002 | 72°F | 58°F | 0" | 0" |
| 1999 | 75°F | 52°F | 0" | 0" |
| 1998 | 69°F | 57°F | 0" | 0" |
| 1997 | 75°F | 57°F | 0.25" | 0" |
| 1996 | 71°F | 43°F | 0.13" | 0" |
| 1995 | 65°F | 57°F | 0" | 0" |
| 1994 | 70°F | 41°F | 0" | 0" |
| 1993 | 60°F | 33°F | 0" | 0" |
| 1992 | 68°F | 41°F | 0" | 0" |
| 1991 | 54°F | 46°F | 2.54" | 0" |
| 1990 | 61°F | 45°F | 1.6" | 0" |
| 1989 | 65°F | 55°F | 1.12" | 0" |
| 1988 | 71°F | 52°F | 0" | 0" |
| 1987 | 55°F | 49°F | 2.29" | 0" |
| 1986 | 70°F | 46°F | 0" | 0" |
| 1985 | 82°F | 57°F | 0" | 0" |
| 1984 | 68°F | 48°F | 0" | 0" |
| 1983 | 77°F | 61°F | 0" | 0" |
| 1982 | 64°F | 43°F | 0" | 0" |
| 1981 | 62°F | 50°F | 5.21" | 0" |
| 1980 | 63°F | 43°F | 0" | 0" |
| 1979 | 70°F | 34°F | 0" | 0" |
| 1978 | 70°F | 43°F | 0" | 0" |
| 1977 | 62°F | 43°F | 0" | 0" |
| 1976 | 76°F | 60°F | 0" | 0" |
| 1975 | 58°F | 53°F | 1.52" | 0" |
| 1974 | 68°F | 44°F | 0.15" | 0" |
| 1973 | 65°F | 47°F | 0.03" | 0" |
| 1972 | 64°F | 45°F | 0" | 0" |
| 1971 | 63°F | 47°F | 0" | 0" |