Weather on August 20
Saint Louis, MO
55 Years of Data
Avg High
87°F
Avg Low
66°F
Warmest
1972
87°F avg
Coldest
2015
65°F avg
About This Date
August 20th in Saint Louis, MO typically brings warm summer weather, with average highs around 87°F and lows near 66°F. Over 51 years of records, the warmest August 20th was in 1972 (87°F average), while the coldest was 2015 (65°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 20th dates historically, with the wettest August 20th recording 1.93" of rain. The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.7°F warmer on this date compared to 20-30 years ago.
Planning for August 20th in Saint Louis, MO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 87° | 72° | 79° | — | — |
| 2024 | 82° | 58° | 70° | — | — |
| 2023 | 99° | 70° | 84° | — | — |
| 2022 | 89° | 67° | 78° | — | — |
| 2021 | 90° | 68° | 79° | — | — |
| 2020 | 83° | 55° | 69° | — | — |
| 2019 | 89° | 68° | 79° | — | — |
| 2018 | 86° | 73° | 80° | 0.61" | — |
| 2017 | 91° | 77° | 84° | — | — |
| 2016 | 88° | 76° | 82° | — | — |
| 2015coldest | 73° | 58° | 65° | — | — |
| 2014 | 90° | 74° | 82° | — | — |
| 2013 | 87° | 69° | 78° | — | — |
| 2012 | 86° | 58° | 72° | — | — |
| 2011 | 92° | 71° | 81° | — | — |
| 2010 | 94° | 73° | 83° | — | — |
| 2009 | 91° | 66° | 79° | 1.78" | — |
| 2008 | 82° | — | — | — | — |
| 2007 | 91° | 75° | 83° | 0.03" | — |
| 2006 | 89° | 74° | 81° | 0.25" | — |
| 2005 | 98° | 76° | 87° | — | — |
| 2004 | 87° | 65° | 76° | 1.93" | — |
| 2003 | 91° | 75° | 83° | — | — |
| 2002 | 86° | 69° | 78° | 0.03" | — |
| 2001 | 78° | 58° | 68° | — | — |
| 2000 | 77° | 64° | 71° | 1.14" | — |
| 1999 | 81° | 63° | 72° | — | — |
| 1998 | 86° | 65° | 75° | — | — |
| 1997 | 70° | 64° | 67° | 1.73" | — |
| 1996 | 91° | 70° | 80° | — | — |
| 1995 | 94° | 76° | 85° | 0.53" | — |
| 1994 | 86° | 64° | 75° | 0.56" | — |
| 1993 | 94° | 73° | 83° | — | — |
| 1992 | 79° | 57° | 68° | — | — |
| 1991 | 80° | 58° | 69° | — | — |
| 1990 | 94° | 69° | 81° | 1.22" | — |
| 1989 | 87° | 65° | 76° | — | — |
| 1988 | 88° | 70° | 79° | — | — |
| 1987 | 93° | 63° | 78° | — | — |
| 1985 | 77° | 56° | 66° | — | — |
| 1981 | 81° | 60° | 70° | — | — |
| 1980 | 89° | 70° | 79° | — | — |
| 1979 | 93° | 73° | 83° | — | — |
| 1978 | 84° | 52° | 68° | — | — |
| 1977 | 80° | 57° | 69° | — | — |
| 1976 | 86° | 56° | 71° | — | — |
| 1975 | 90° | 65° | 77° | — | — |
| 1974 | 90° | 63° | 76° | — | — |
| 1973 | 92° | 63° | 77° | — | — |
| 1972warmest | 97° | 78° | 87° | — | — |
| 1971 | 96° | 62° | 79° | — | — |
51 years of data from ST LOUIS ST LOUIS UNIV