Weather on July 21
Saint Louis, MO
55 Years of Data
About This Date
July 21st in Saint Louis, MO typically brings hot summer weather, with average highs around 90°F and lows near 70°F. Over 52 years of records, the warmest July 21st was in 2017 (90°F average), while the coldest was 1971 (68°F) — a 22°F range across recorded history. Rain or other precipitation has occurred on about 27% of July 21st dates historically, with the wettest July 21st recording 6.05" 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 July 21st in Saint Louis, MO? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 88° | 72° | 80° | 6.05" | — |
| 2024 | 81° | 69° | 75° | — | — |
| 2023 | 81° | 65° | 73° | — | — |
| 2022 | 98° | 66° | 82° | — | — |
| 2021 | 89° | 63° | 76° | — | — |
| 2020 | 91° | 70° | 80° | 2.84" | — |
| 2019 | 93° | 79° | 86° | — | — |
| 2018 | 96° | 70° | 83° | — | — |
| 2017warmest | 100° | 80° | 90° | — | — |
| 2016 | 93° | 73° | 83° | 0.41" | — |
| 2015 | 81° | 72° | 76° | 0.56" | — |
| 2014 | 85° | 69° | 77° | — | — |
| 2013 | 94° | 74° | 84° | 0.1" | — |
| 2012 | 86° | 69° | 78° | — | — |
| 2011 | 100° | 78° | 89° | — | — |
| 2010 | 91° | 71° | 81° | 0.58" | — |
| 2009 | 81° | 62° | 71° | — | — |
| 2008 | 97° | 74° | 85° | — | — |
| 2007 | 78° | 57° | 68° | — | — |
| 2006 | 96° | 79° | 87° | — | — |
| 2005 | 94° | 74° | 84° | — | — |
| 2004 | 91° | 74° | 82° | — | — |
| 2003 | 96° | 67° | 81° | — | — |
| 2002 | 94° | 76° | 85° | — | — |
| 2001 | 84° | 73° | 79° | — | — |
| 2000 | 77° | 59° | 68° | — | — |
| 1999 | 95° | 77° | 86° | 0.89" | — |
| 1998 | 96° | 78° | 87° | — | — |
| 1997 | 92° | 74° | 83° | — | — |
| 1996 | 82° | 72° | 77° | 0.51" | — |
| 1995 | 90° | 69° | 79° | — | — |
| 1994 | 90° | 71° | 80° | 0.79" | — |
| 1993 | 87° | 69° | 78° | 3.43" | — |
| 1992 | 88° | 66° | 77° | 1.8" | — |
| 1991 | 94° | 75° | 84° | — | — |
| 1990 | 92° | 70° | 81° | 0.25" | — |
| 1989 | 80° | 61° | 70° | 2.95" | — |
| 1988 | 84° | 59° | 72° | — | — |
| 1987 | 95° | 68° | 82° | — | — |
| 1986 | 88° | 69° | 78° | — | — |
| 1985 | 82° | 69° | 76° | 0.08" | — |
| 1981 | 94° | 66° | 80° | — | — |
| 1980 | 105° | 65° | 85° | — | — |
| 1979 | 84° | 59° | 72° | — | — |
| 1978 | 88° | 70° | 79° | — | — |
| 1977 | 92° | 72° | 82° | — | — |
| 1976 | 97° | 71° | 84° | — | — |
| 1975 | 93° | 68° | 81° | — | — |
| 1974 | 90° | 72° | 81° | — | — |
| 1973 | 94° | 72° | 83° | — | — |
| 1972 | 97° | 77° | 87° | — | — |
| 1971coldest | 81° | 55° | 68° | — | — |
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.