Weather on May 21
Knoxville, TN
55 Years of Data
Avg High
79°F
Avg Low
57°F
Warmest
2017
81°F avg
Coldest
2002
51°F avg
About This Date
May 21st in Knoxville, TN typically brings pleasant spring weather, with average highs around 79°F and lows near 57°F. Over 55 years of records, the warmest May 21st was in 2017 (81°F average), while the coldest was 2002 (51°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 21st dates historically, with the wettest May 21st recording 1.35" of rain. The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.3°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Knoxville, TN? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 79° | 57° | 68° | 0.38" | — |
| 2024 | 86° | 55° | 71° | — | — |
| 2023 | 75° | 60° | 68° | 0.38" | — |
| 2022 | 91° | 70° | 80° | — | — |
| 2021 | 84° | 54° | 69° | — | — |
| 2020 | 70° | 53° | 61° | — | — |
| 2019 | 84° | 52° | 68° | — | — |
| 2018 | 90° | 66° | 78° | — | — |
| 2017warmest | 92° | 70° | 81° | — | — |
| 2016 | 76° | 59° | 67° | — | — |
| 2015 | 84° | 63° | 73° | 1.35" | — |
| 2014 | 81° | 55° | 68° | — | — |
| 2013 | 84° | 61° | 72° | — | — |
| 2012 | 84° | 58° | 71° | — | — |
| 2011 | 76° | 55° | 65° | — | — |
| 2010 | 82° | 57° | 70° | 0.13" | — |
| 2009 | 80° | 51° | 66° | — | — |
| 2008 | 81° | 48° | 64° | — | — |
| 2007 | 79° | 45° | 62° | — | — |
| 2006 | 79° | 58° | 68° | 0.13" | — |
| 2005 | 73° | 56° | 64° | 0.61" | — |
| 2004 | 87° | 66° | 77° | — | — |
| 2003 | 73° | 62° | 68° | 0.56" | — |
| 2002coldest | 63° | 39° | 51° | — | — |
| 2001 | 81° | 64° | 72° | — | — |
| 2000 | 80° | 63° | 71° | 0.2" | — |
| 1999 | 74° | 47° | 60° | — | — |
| 1998 | 87° | 62° | 75° | — | — |
| 1997 | 84° | 48° | 66° | — | — |
| 1996 | 86° | 62° | 74° | — | — |
| 1995 | 76° | 48° | 62° | — | — |
| 1994 | 72° | 45° | 58° | — | — |
| 1993 | 67° | 41° | 54° | 0.03" | — |
| 1992 | 78° | 59° | 69° | — | — |
| 1991 | 80° | 59° | 70° | 0.05" | — |
| 1990 | 77° | 62° | 70° | 0.1" | — |
| 1989 | 75° | 58° | 66° | — | — |
| 1988 | 86° | 51° | 69° | — | — |
| 1987 | 79° | 63° | 71° | — | — |
| 1986 | 70° | 48° | 59° | — | — |
| 1985 | 85° | 58° | 71° | 0.56" | — |
| 1984 | 83° | 55° | 69° | — | — |
| 1983 | 81° | 62° | 71° | 0.56" | — |
| 1982 | 78° | 62° | 70° | — | — |
| 1981 | 59° | 48° | 54° | 0.36" | — |
| 1980 | 70° | 58° | 64° | 0.1" | — |
| 1979 | 80° | 64° | 72° | 0.74" | — |
| 1978 | 85° | 65° | 75° | — | — |
| 1977 | 88° | 60° | 74° | — | — |
| 1976 | 78° | 52° | 65° | — | — |
| 1975 | 88° | 63° | 75° | — | — |
| 1974 | 85° | 65° | 75° | 0.03" | — |
| 1973 | 74° | 48° | 61° | — | — |
| 1972 | 73° | 58° | 65° | 0.64" | — |
| 1971 | 79° | 53° | 66° | — | — |
55 years of data from KNOXVILLE UNIV OF TENN