Weather on August 18
Saint Louis, MO
55 Years of Data
Avg High
88°F
Avg Low
66°F
Warmest
1972
89°F avg
Coldest
1981
68°F avg
About This Date
August 18th in Saint Louis, MO typically brings warm summer weather, with average highs around 88°F and lows near 66°F. Over 50 years of records, the warmest August 18th was in 1972 (89°F average), while the coldest was 1981 (68°F) — a 21°F range across recorded history. Rain or other precipitation has occurred on about 20% of August 18th dates historically, with the wettest August 18th recording 10.85" 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 August 18th in Saint Louis, MO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
0.3°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 97° | 73° | 85° | — | — |
| 2024 | 86° | 66° | 76° | — | — |
| 2023 | 83° | 55° | 69° | — | — |
| 2022 | 86° | 59° | 73° | — | — |
| 2021 | 87° | 65° | 76° | — | — |
| 2020 | 84° | 68° | 76° | — | — |
| 2019 | 90° | 72° | 81° | — | — |
| 2018 | 89° | 72° | 80° | 0.28" | — |
| 2017 | 90° | 69° | 79° | — | — |
| 2016 | 88° | 71° | 79° | — | — |
| 2015 | 90° | 74° | 82° | — | — |
| 2014 | 83° | 70° | 76° | — | — |
| 2013 | 81° | 67° | 74° | — | — |
| 2012 | 81° | 57° | 69° | — | — |
| 2011 | 90° | 70° | 80° | — | — |
| 2010 | 85° | 69° | 77° | — | — |
| 2009 | 90° | 68° | 79° | 2.54" | — |
| 2008 | 82° | 57° | 70° | — | — |
| 2007 | 88° | 71° | 79° | — | — |
| 2006 | 89° | 69° | 79° | — | — |
| 2005 | 82° | 71° | 77° | — | — |
| 2004 | 86° | 61° | 73° | — | — |
| 2003 | 99° | 75° | 87° | — | — |
| 2002 | 87° | 67° | 77° | 0.48" | — |
| 2001 | 85° | 67° | 76° | — | — |
| 2000 | 100° | 67° | 83° | 2.01" | — |
| 1999 | 87° | 63° | 75° | — | — |
| 1998 | 89° | 68° | 79° | 10.85" | — |
| 1997 | 83° | 69° | 76° | 0.23" | — |
| 1996 | 81° | 69° | 75° | 1.14" | — |
| 1995 | 100° | 77° | 89° | — | — |
| 1994 | 88° | 66° | 77° | — | — |
| 1993 | 93° | 77° | 85° | — | — |
| 1992 | 86° | 57° | 72° | — | — |
| 1991 | 87° | 59° | 73° | — | — |
| 1990 | 92° | 72° | 82° | — | — |
| 1989 | 84° | 61° | 72° | — | — |
| 1988 | 102° | 70° | 86° | — | — |
| 1987 | 88° | 59° | 73° | — | — |
| 1981coldest | 77° | 59° | 68° | — | — |
| 1980 | 95° | 71° | 83° | 0.46" | — |
| 1979 | 89° | 57° | 73° | — | — |
| 1978 | 85° | 73° | 79° | — | — |
| 1977 | 81° | 58° | 69° | — | — |
| 1976 | 83° | 55° | 69° | — | — |
| 1975 | 88° | 63° | 75° | 1.35" | — |
| 1974 | 87° | 68° | 78° | 0.03" | — |
| 1973 | 81° | 64° | 72° | — | — |
| 1972warmest | 101° | 78° | 89° | — | — |
| 1971 | 86° | 54° | 70° | — | — |
50 years of data from ST LOUIS ST LOUIS UNIV