Weather on October 21
Saint Louis, MO
55 Years of Data
Avg High
69°F
Avg Low
44°F
Warmest
1979
76°F avg
Coldest
1976
39°F avg
About This Date
October 21st in Saint Louis, MO typically brings mild fall weather, with average highs around 69°F and lows near 44°F — a 25°F daily swing. Over 52 years of records, the warmest October 21st was in 1979 (76°F average), while the coldest was 1976 (39°F) — a 37°F range across recorded history. Rain or other precipitation has occurred on about 17% of October 21st dates historically, with the wettest October 21st recording 1.4" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for October 21st in Saint Louis, MO? Great weather for outdoor activities.
Warming Trend
0.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 48° | 57° | — | — |
| 2024 | 79° | 40° | 59° | — | — |
| 2023 | 80° | 41° | 61° | — | — |
| 2022 | 82° | 42° | 62° | — | — |
| 2021 | 66° | 50° | 58° | — | — |
| 2020 | 59° | 52° | 55° | 0.41" | — |
| 2019 | 69° | 52° | 60° | 0.58" | — |
| 2018 | 56° | 25° | 41° | — | — |
| 2017 | 76° | 63° | 69° | — | — |
| 2016 | 63° | 42° | 52° | — | — |
| 2015 | 80° | 58° | 69° | 0.05" | — |
| 2014 | 74° | 48° | 61° | — | — |
| 2013 | 72° | 48° | 60° | — | — |
| 2012 | 66° | 49° | 57° | — | — |
| 2011 | 56° | 37° | 46° | — | — |
| 2010 | 74° | 41° | 57° | — | — |
| 2009 | 75° | 46° | 61° | — | — |
| 2008 | 72° | 42° | 57° | — | — |
| 2007 | 82° | 49° | 65° | — | — |
| 2006 | 65° | 35° | 50° | — | — |
| 2005 | 67° | 50° | 58° | 1.19" | — |
| 2004 | 58° | 51° | 54° | — | — |
| 2003 | 89° | 60° | 75° | — | — |
| 2002 | 57° | 35° | 46° | — | — |
| 2001 | 75° | 43° | 59° | — | — |
| 2000 | 76° | 46° | 61° | — | — |
| 1999 | 58° | 37° | 47° | — | — |
| 1998 | 65° | 46° | 55° | — | — |
| 1997 | 59° | 46° | 53° | — | — |
| 1996 | 66° | 53° | 60° | 1.32" | — |
| 1995 | 54° | 39° | 46° | — | — |
| 1994 | 76° | 45° | 60° | — | — |
| 1993 | 62° | 43° | 52° | — | — |
| 1992 | 76° | 47° | 61° | — | — |
| 1991 | 72° | 50° | 61° | — | — |
| 1990 | 69° | 37° | 53° | — | — |
| 1989 | 73° | 35° | 54° | — | — |
| 1988 | 67° | 43° | 55° | — | — |
| 1987 | 60° | 27° | 43° | 0.43" | — |
| 1986 | 80° | 47° | 63° | — | — |
| 1985 | 67° | 50° | 58° | — | — |
| 1982 | 55° | 27° | 41° | 0.03" | — |
| 1980 | 74° | 42° | 58° | — | — |
| 1979warmest | 80° | 71° | 76° | — | — |
| 1978 | 78° | 44° | 61° | — | — |
| 1977 | 70° | 39° | 54° | — | — |
| 1976coldest | 48° | 31° | 39° | 0.03" | — |
| 1975 | 82° | 44° | 63° | — | — |
| 1974 | 55° | 26° | 41° | — | — |
| 1973 | 68° | 41° | 55° | — | — |
| 1972 | 55° | 37° | 46° | — | — |
| 1971 | 83° | 50° | 66° | 1.4" | — |
52 years of data from ST LOUIS ST LOUIS UNIV