Weather on May 21 at Acadia
Acadia National Park
Based on 55 years of data from Bar Harbor, ME
Planning Your Visit
May 21st in Acadia National Park (via Bar Harbor, ME) typically brings mild spring weather, with average highs around 68°F and lows near 46°F. Over 55 years of records, the warmest May 21st was in 2009 (73°F average), while the coldest was 1976 (45°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 35% of May 21st dates historically, with the wettest May 21st recording 4.04" of rain. The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.6°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Acadia? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Year by Year History
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2026 | 64°F | 48°F | -- | -- |
| 2025 | 56°F | 41°F | -- | -- |
| 2024 | 68°F | 49°F | -- | -- |
| 2023 | 75°F | 54°F | -- | -- |
| 2022 | 58°F | 47°F | -- | -- |
| 2021 | 70°F | 48°F | -- | -- |
| 2020 | 72°F | 47°F | -- | -- |
| 2019 | 60°F | 45°F | -- | -- |
| 2018 | 71°F | 51°F | -- | -- |
| 2017 | 71°F | 45°F | -- | -- |
| 2016 | 78°F | 53°F | -- | -- |
| 2015 | 66°F | 41°F | -- | -- |
| 2014 | 60°F | 52°F | 0.3" | -- |
| 2013 | 55°F | 46°F | 0.2" | -- |
| 2012 | 78°F | 54°F | 0" | -- |
| 2011 | 64°F | 50°F | 0.03" | -- |
| 2010 | 76°F | 51°F | 0" | 0" |
| 2009 | 85°F | 62°F | 0" | 0" |
| 2008 | 63°F | 44°F | 0.64" | 0" |
| 2007 | 50°F | 41°F | 0.05" | 0" |
| 2006 | 64°F | 48°F | 0" | 0" |
| 2005 | 51°F | 42°F | -- | -- |
| 2004 | 74°F | 46°F | 0" | 0" |
| 2003 | 83°F | 59°F | 0" | 0" |
| 2002 | 59°F | 36°F | 0" | 0" |
| 2001 | 69°F | 41°F | 0" | 0" |
| 2000 | 66°F | 34°F | 0" | 0" |
| 1999 | 69°F | 45°F | 0.03" | 0" |
| 1998 | 76°F | 50°F | 0" | 0" |
| 1997 | 60°F | 37°F | 0.03" | 0" |
| 1996 | 75°F | 48°F | 0.46" | 0" |
| 1995 | 73°F | 46°F | 0.05" | 0" |
| 1994 | 68°F | 37°F | 0" | 0" |
| 1993 | 59°F | 45°F | 0.48" | 0" |
| 1992 | 87°F | 50°F | 0" | 0" |
| 1991 | 77°F | 47°F | 0" | 0" |
| 1990 | 53°F | 37°F | 0" | 0" |
| 1989 | 77°F | 50°F | 0" | 0" |
| 1987 | 62°F | 40°F | 0" | 0" |
| 1986 | 65°F | 46°F | 0" | 0" |
| 1985 | 69°F | 38°F | 0.05" | 0" |
| 1984 | 68°F | 49°F | 0.48" | 0" |
| 1983 | 72°F | 50°F | 2.36" | 0" |
| 1982 | 74°F | 44°F | 0.2" | 0" |
| 1981 | 71°F | 43°F | 0" | 0" |
| 1980 | 65°F | 41°F | 0.76" | 0" |
| 1979 | 58°F | 48°F | 1.37" | 0" |
| 1978 | 65°F | 45°F | 0.33" | 0" |
| 1977 | 76°F | 45°F | 0" | 0" |
| 1976 | 53°F | 38°F | 0" | 0" |
| 1975 | 70°F | 48°F | 0" | 0" |
| 1974 | 68°F | 40°F | 0" | 0" |
| 1973 | 62°F | 45°F | 4.04" | 0" |
| 1972 | 79°F | 45°F | 1.5" | 0" |
| 1971 | 70°F | 50°F | 0" | 0" |