Weather on August 21
Knoxville, TN
55 Years of Data
Avg High
87°F
Avg Low
66°F
Warmest
1983
86°F avg
Coldest
1991
66°F avg
About This Date
August 21st in Knoxville, TN typically brings warm summer weather, with average highs around 87°F and lows near 66°F. Over 55 years of records, the warmest August 21st was in 1983 (86°F average), while the coldest was 1991 (66°F) — a 20°F range across recorded history. Rain or other precipitation has occurred on about 35% of August 21st dates historically, with the wettest August 21st recording 5.44" of rain. The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for August 21st in Knoxville, TN? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 91° | 65° | 78° | 0.2" | — |
| 2024 | 81° | 57° | 69° | — | — |
| 2023 | 90° | 60° | 75° | — | — |
| 2022 | 89° | 66° | 78° | — | — |
| 2021 | 91° | 72° | 81° | 2.29" | — |
| 2020 | 84° | 68° | 76° | 0.08" | — |
| 2019 | 92° | 69° | 80° | 0.05" | — |
| 2018 | 87° | 70° | 78° | — | — |
| 2017 | 91° | 64° | 78° | — | — |
| 2016 | 90° | 71° | 80° | — | — |
| 2015 | 80° | 65° | 72° | — | — |
| 2014 | 87° | 66° | 77° | 2.18" | — |
| 2013 | 84° | 68° | 76° | 0.86" | — |
| 2012 | 82° | 56° | 69° | — | — |
| 2011 | 91° | 69° | 80° | — | — |
| 2010 | 92° | 72° | 82° | 0.18" | — |
| 2009 | 87° | 70° | 78° | 0.3" | — |
| 2008 | 93° | 63° | 78° | — | — |
| 2007 | 96° | 70° | 83° | — | — |
| 2006 | 82° | 71° | 77° | 1.07" | — |
| 2005 | 93° | 74° | 83° | — | — |
| 2004 | 82° | 64° | 73° | 1.32" | — |
| 2003 | 90° | 69° | 79° | 0.03" | — |
| 2002 | 91° | 68° | 80° | — | — |
| 2001 | 83° | 57° | 70° | — | — |
| 2000 | 77° | 64° | 71° | 0.81" | — |
| 1999 | 86° | 61° | 73° | — | — |
| 1998 | 85° | 63° | 74° | — | — |
| 1997 | 82° | 64° | 73° | 0.28" | — |
| 1996 | 90° | 67° | 78° | — | — |
| 1995 | 84° | 68° | 76° | 0.2" | — |
| 1994 | 87° | 66° | 77° | 0.43" | — |
| 1993 | 92° | 66° | 79° | 5.44" | — |
| 1992 | 84° | 62° | 73° | — | — |
| 1991coldest | 78° | 54° | 66° | — | — |
| 1990 | 95° | 65° | 80° | — | — |
| 1989 | 88° | 66° | 77° | — | — |
| 1988 | 80° | 71° | 76° | 0.1" | — |
| 1987 | 96° | 59° | 78° | — | — |
| 1986 | 86° | 68° | 77° | — | — |
| 1985 | 87° | 67° | 77° | — | — |
| 1984 | 86° | 61° | 73° | — | — |
| 1983warmest | 102° | 70° | 86° | — | — |
| 1982 | 89° | 71° | 80° | — | — |
| 1981 | 83° | 65° | 74° | 3.56" | — |
| 1980 | 90° | 70° | 80° | — | — |
| 1979 | 91° | 72° | 81° | — | — |
| 1978 | 88° | 66° | 77° | — | — |
| 1977 | 81° | 62° | 71° | — | — |
| 1976 | 84° | 58° | 71° | — | — |
| 1975 | 87° | 69° | 78° | — | — |
| 1974 | 86° | 66° | 76° | — | — |
| 1973 | 81° | 63° | 72° | 1.68" | — |
| 1972 | 91° | 69° | 80° | — | — |
| 1971 | 87° | 69° | 78° | — | — |
55 years of data from KNOXVILLE UNIV OF TENN