Weather on April 21
Knoxville, TN
55 Years of Data
Avg High
73°F
Avg Low
48°F
Warmest
2002
76°F avg
Coldest
1978
46°F avg
About This Date
April 21st in Knoxville, TN typically brings pleasant spring weather, with average highs around 73°F and lows near 48°F — a 25°F daily swing. Over 55 years of records, the warmest April 21st was in 2002 (76°F average), while the coldest was 1978 (46°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 42% of April 21st dates historically, with the wettest April 21st recording 2.95" of rain. The last decade has been 4.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.4°F cooler on this date compared to 20-30 years ago.
Planning for April 21st in Knoxville, TN? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
1.2°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 56° | 67° | 0.43" | — |
| 2024 | 60° | 44° | 52° | 0.33" | — |
| 2023 | 85° | 49° | 67° | — | — |
| 2022 | 75° | 33° | 54° | — | — |
| 2021 | 62° | 32° | 47° | — | — |
| 2020 | 67° | 45° | 56° | — | — |
| 2019 | 52° | 43° | 47° | 0.33" | — |
| 2018 | 66° | 38° | 52° | — | — |
| 2017 | 82° | 59° | 71° | 0.53" | — |
| 2016 | 80° | 60° | 70° | 0.38" | — |
| 2015 | 73° | 41° | 57° | — | — |
| 2014 | 76° | 40° | 58° | — | — |
| 2013 | 62° | 37° | 50° | — | — |
| 2012 | 75° | 53° | 64° | — | — |
| 2011 | 77° | 53° | 65° | 0.84" | — |
| 2010 | 56° | 48° | 52° | 1.14" | — |
| 2009 | 63° | 44° | 53° | 0.18" | — |
| 2008 | 65° | 42° | 53° | — | — |
| 2007 | 69° | 40° | 54° | — | — |
| 2006 | 69° | 57° | 63° | 1.5" | — |
| 2005 | 80° | 50° | 65° | — | — |
| 2004 | 80° | 52° | 66° | — | — |
| 2003 | 76° | 58° | 67° | 0.36" | — |
| 2002warmest | 87° | 65° | 76° | — | — |
| 2001 | 71° | 40° | 55° | — | — |
| 2000 | 84° | 53° | 69° | 0.61" | — |
| 1999 | 73° | 42° | 58° | — | — |
| 1998 | 62° | 40° | 51° | — | — |
| 1997 | 68° | 46° | 57° | 0.2" | — |
| 1996 | 71° | 56° | 63° | 2.95" | — |
| 1995 | 77° | 61° | 69° | 1.63" | — |
| 1994 | 81° | 43° | 62° | — | — |
| 1993 | 74° | 49° | 61° | 1.19" | — |
| 1992 | 83° | 59° | 71° | 1.32" | — |
| 1991 | 57° | 46° | 52° | 0.03" | — |
| 1990 | 72° | 52° | 62° | 0.18" | — |
| 1989 | 75° | 48° | 62° | — | — |
| 1988 | 68° | 32° | 50° | — | — |
| 1987 | 82° | 49° | 65° | — | — |
| 1986 | 78° | 48° | 63° | 1.27" | — |
| 1985 | 85° | 53° | 69° | — | — |
| 1984 | 59° | 43° | 51° | 0.08" | — |
| 1983 | 62° | 35° | 49° | — | — |
| 1982 | 75° | 50° | 63° | 0.15" | — |
| 1981 | 61° | 45° | 53° | — | — |
| 1980 | 78° | 51° | 65° | — | — |
| 1979 | 80° | 52° | 66° | — | — |
| 1978coldest | 54° | 39° | 46° | 0.05" | — |
| 1977 | 80° | 60° | 70° | — | — |
| 1976 | 86° | 62° | 74° | — | — |
| 1975 | 69° | 42° | 56° | — | — |
| 1974 | 78° | 55° | 67° | — | — |
| 1973 | 80° | 55° | 68° | — | — |
| 1972 | 83° | 63° | 73° | 2.69" | — |
| 1971 | 78° | 55° | 67° | — | — |
55 years of data from KNOXVILLE UNIV OF TENN