Weather on April 21
Saint Louis, MO
55 Years of Data
Avg High
69°F
Avg Low
47°F
Warmest
1985
75°F avg
Coldest
2021
42°F avg
About This Date
April 21st in Saint Louis, MO typically brings mild spring weather, with average highs around 69°F and lows near 47°F. Over 55 years of records, the warmest April 21st was in 1985 (75°F average), while the coldest was 2021 (42°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 44% of April 21st dates historically, with the wettest April 21st recording 1.3" of rain. The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
The last decade has been 4.8°F cooler on this date compared to 20-30 years ago.
Planning for April 21st in Saint Louis, MO? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 68° | 50° | 59° | — | — |
| 2024 | 61° | 37° | 49° | — | — |
| 2023 | 67° | 48° | 57° | — | — |
| 2022 | 76° | 53° | 64° | 0.03" | — |
| 2021coldest | 52° | 31° | 42° | — | — |
| 2020 | 66° | 40° | 53° | — | — |
| 2019 | 80° | 38° | 59° | — | — |
| 2018 | 69° | 36° | 52° | — | — |
| 2017 | 83° | 49° | 66° | 0.03" | — |
| 2016 | 69° | 58° | 63° | 0.79" | — |
| 2015 | 59° | 45° | 52° | — | — |
| 2014 | 81° | 63° | 72° | 0.1" | — |
| 2013 | 56° | 42° | 49° | — | — |
| 2012 | 57° | 42° | 50° | 0.15" | — |
| 2011 | 56° | 41° | 48° | — | — |
| 2010 | 69° | 41° | 55° | — | — |
| 2009 | 65° | 41° | 53° | — | — |
| 2008 | 71° | 50° | 61° | — | — |
| 2007 | 70° | 44° | 57° | — | — |
| 2006 | 76° | 52° | 64° | — | — |
| 2005 | 82° | 58° | 70° | 0.61" | — |
| 2004 | 81° | 56° | 68° | 0.38" | — |
| 2003 | 66° | 51° | 59° | — | — |
| 2002 | 60° | 51° | 56° | 0.33" | — |
| 2001 | 72° | 64° | 68° | 0.05" | — |
| 2000 | 75° | 42° | 59° | — | — |
| 1999 | 72° | 53° | 62° | 1.04" | — |
| 1998 | 69° | 48° | 59° | — | — |
| 1997 | 60° | 49° | 54° | 1.14" | — |
| 1996 | 72° | 42° | 57° | — | — |
| 1995 | 67° | 48° | 57° | — | — |
| 1994 | 68° | 50° | 59° | 0.28" | — |
| 1993 | 57° | 37° | 47° | 0.1" | — |
| 1992 | 69° | 42° | 56° | 0.03" | — |
| 1991 | 58° | 36° | 47° | — | — |
| 1990 | 73° | 45° | 59° | 0.94" | — |
| 1989 | 80° | 45° | 62° | — | — |
| 1988 | 74° | 45° | 59° | — | — |
| 1987 | 86° | 54° | 70° | — | — |
| 1986 | 57° | 34° | 45° | 0.28" | — |
| 1985warmest | 85° | 66° | 75° | — | — |
| 1984 | 60° | 48° | 54° | 1.27" | — |
| 1983 | 58° | 37° | 47° | — | — |
| 1982 | 63° | 34° | 48° | — | — |
| 1981 | 55° | 42° | 49° | — | — |
| 1980 | 85° | 56° | 70° | — | — |
| 1979 | 83° | 56° | 69° | 0.15" | — |
| 1978 | 46° | 39° | 43° | — | — |
| 1977 | 79° | 59° | 69° | 0.86" | — |
| 1976 | 76° | 54° | 65° | 0.51" | — |
| 1975 | 65° | 37° | 51° | — | — |
| 1974 | 82° | 58° | 70° | 1.27" | — |
| 1973 | 80° | 65° | 72° | 0.13" | — |
| 1972 | 69° | 54° | 61° | 1.17" | — |
| 1971 | 87° | 52° | 69° | 1.3" | — |
55 years of data from ST LOUIS ST LOUIS UNIV