Weather on August 18
Saint Louis, MO
55 Years of Data
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.
| 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° | — | — |
Saint Louis, MO Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Saint Louis, MO Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Saint Louis, MO Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Saint Louis, MO
Saint Louis, MO has no months that meet our "pleasant" threshold — every season has tradeoffs.