Weather on September 18 at Acadia
Acadia National Park
Based on 53 years of data from Bar Harbor, ME
Planning Your Visit
September 18th in Acadia National Park (via Bar Harbor, ME) typically brings mild fall weather, with average highs around 68°F and lows near 50°F. Over 53 years of records, the warmest September 18th was in 2015 (74°F average), while the coldest was 1990 (46°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 28% of September 18th dates historically, with the wettest September 18th recording 4.55" of rain. The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.0°F warmer on this date compared to 20-30 years ago.
Planning for September 18th in Acadia? Great weather for outdoor activities.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 77°F | 59°F | -- | -- |
| 2024 | 86°F | 61°F | -- | -- |
| 2023 | 67°F | 55°F | -- | -- |
| 2022 | 65°F | 52°F | -- | -- |
| 2021 | 79°F | 59°F | -- | -- |
| 2020 | 56°F | 43°F | -- | -- |
| 2019 | 60°F | 46°F | -- | -- |
| 2018 | 72°F | 55°F | -- | -- |
| 2017 | 62°F | 56°F | -- | -- |
| 2016 | 69°F | 63°F | -- | -- |
| 2015 | 84°F | 64°F | -- | -- |
| 2014 | 69°F | 41°F | -- | -- |
| 2013 | 69°F | 48°F | -- | -- |
| 2012 | 68°F | 54°F | 0" | -- |
| 2011 | 66°F | 50°F | 0" | -- |
| 2010 | 67°F | 48°F | 0" | 0" |
| 2009 | 62°F | 41°F | 0" | 0" |
| 2008 | 68°F | 42°F | 0" | 0" |
| 2007 | 65°F | 48°F | 0" | 0" |
| 2006 | 77°F | 60°F | 0" | 0" |
| 2005 | 61°F | 56°F | 0.13" | 0" |
| 2004 | 71°F | 49°F | 4.55" | 0" |
| 2003 | 76°F | 58°F | 0" | 0" |
| 2002 | 66°F | 47°F | 0" | 0" |
| 2001 | 77°F | 50°F | 0" | 0" |
| 1999 | 66°F | 50°F | 1.88" | 0" |
| 1997 | 72°F | 49°F | 0.03" | 0" |
| 1996 | 60°F | 51°F | 0.53" | 0" |
| 1995 | 64°F | 52°F | 2.49" | 0" |
| 1994 | 76°F | 48°F | 0.03" | 0" |
| 1993 | 59°F | 49°F | 1.04" | 0" |
| 1992 | 84°F | 62°F | 0" | 0" |
| 1991 | 81°F | 55°F | 0" | 0" |
| 1990 | 59°F | 34°F | 0" | 0" |
| 1989 | 70°F | 48°F | 0" | 0" |
| 1988 | 67°F | 50°F | 0.89" | 0" |
| 1987 | 67°F | 44°F | 0" | 0" |
| 1986 | 64°F | 41°F | 0" | 0" |
| 1985 | 73°F | 48°F | 0" | 0" |
| 1984 | 67°F | 42°F | 0" | 0" |
| 1983 | 66°F | 53°F | 2.92" | 0" |
| 1982 | 64°F | 48°F | 0" | 0" |
| 1981 | 68°F | 48°F | 0" | 0" |
| 1980 | 66°F | 55°F | 2.39" | 0" |
| 1979 | 72°F | 48°F | 0" | 0" |
| 1978 | 61°F | 40°F | 0" | 0" |
| 1977 | 61°F | 53°F | 0.53" | 0" |
| 1976 | 72°F | 58°F | 0" | 0" |
| 1975 | 64°F | 45°F | 0.03" | 0" |
| 1974 | 65°F | 43°F | 0" | 0" |
| 1973 | 62°F | 44°F | 0.1" | 0" |
| 1972 | 74°F | 56°F | 0" | 0" |
| 1971 | 66°F | 56°F | 0.05" | 0" |