Weather on August 21
Duluth, MN
55 Years of Data
Avg High
73°F
Avg Low
58°F
Warmest
2013
80°F avg
Coldest
2004
52°F avg
About This Date
August 21st in Duluth, MN typically brings pleasant summer weather, with average highs around 73°F and lows near 58°F. Over 55 years of records, the warmest August 21st was in 2013 (80°F average), while the coldest was 2004 (52°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 21st dates historically, with the wettest August 21st recording 3.15" of rain. The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.4°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Duluth, MN? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 72° | 60° | 66° | — | — |
| 2024 | 69° | 56° | 62° | — | — |
| 2023 | 66° | 63° | 64° | — | — |
| 2022 | 80° | 60° | 70° | — | — |
| 2021 | 81° | 60° | 70° | — | — |
| 2020 | 65° | 61° | 63° | — | — |
| 2019 | 76° | 58° | 67° | — | — |
| 2018 | 75° | 61° | 68° | 0.05" | — |
| 2017 | 69° | 56° | 62° | 2.64" | — |
| 2016 | 73° | 56° | 64° | — | — |
| 2015 | 70° | 50° | 60° | — | — |
| 2014 | 63° | 60° | 61° | 0.1" | — |
| 2013warmest | 87° | 73° | 80° | — | — |
| 2012 | 80° | 51° | 66° | — | — |
| 2011 | 78° | 52° | 65° | 0.18" | — |
| 2010 | 66° | 54° | 60° | — | — |
| 2009 | 71° | 57° | 64° | 0.08" | — |
| 2008 | 79° | 64° | 71° | — | — |
| 2007 | 72° | 59° | 65° | 0.05" | — |
| 2006 | 81° | 54° | 67° | — | — |
| 2005 | 68° | 56° | 62° | — | — |
| 2004coldest | 70° | 34° | 52° | — | — |
| 2003 | 82° | 68° | 75° | — | — |
| 2002 | 78° | 47° | 62° | — | — |
| 2001 | 70° | 57° | 63° | — | — |
| 2000 | 68° | 55° | 62° | — | — |
| 1999 | 77° | 57° | 67° | — | — |
| 1998 | 84° | 66° | 75° | — | — |
| 1997 | 66° | 56° | 61° | — | — |
| 1996 | 69° | 58° | 63° | — | — |
| 1995 | 80° | 61° | 70° | — | — |
| 1994 | 78° | 57° | 68° | — | — |
| 1993 | 68° | 51° | 60° | — | — |
| 1992 | 78° | 61° | 69° | — | — |
| 1991 | 81° | 55° | 68° | — | — |
| 1990 | 63° | 57° | 60° | — | — |
| 1989 | 65° | 53° | 59° | — | — |
| 1988 | 65° | 60° | 62° | — | — |
| 1987 | 77° | 63° | 70° | 0.03" | — |
| 1986 | 69° | 56° | 62° | — | — |
| 1985 | 63° | 48° | 55° | — | — |
| 1984 | 83° | 65° | 74° | 1.02" | — |
| 1983 | 73° | 63° | 68° | 0.05" | — |
| 1982 | 65° | 59° | 62° | — | — |
| 1981 | 68° | 65° | 66° | 0.36" | — |
| 1980 | 75° | 65° | 70° | — | — |
| 1979 | 60° | 56° | 58° | — | — |
| 1978 | 83° | 62° | 72° | — | — |
| 1977 | 69° | 51° | 60° | — | — |
| 1976 | 85° | 74° | 79° | — | — |
| 1975 | 75° | 61° | 68° | — | — |
| 1974 | 73° | 62° | 68° | 0.1" | — |
| 1973 | 65° | 58° | 61° | — | — |
| 1972 | 77° | 58° | 67° | 3.15" | — |
| 1971 | 80° | 59° | 70° | — | — |
55 years of data from DULUTH HARBOR STN