Weather on September 23
Saint Louis, MO
55 Years of Data
Avg High
77°F
Avg Low
53°F
Warmest
2005
81°F avg
Coldest
1974
47°F avg
About This Date
September 23rd in Saint Louis, MO typically brings pleasant fall weather, with average highs around 77°F and lows near 53°F. Over 53 years of records, the warmest September 23rd was in 2005 (81°F average), while the coldest was 1974 (47°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 28% of September 23rd dates historically, with the wettest September 23rd recording 8" of rain. The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.6°F warmer on this date compared to 20-30 years ago.
Planning for September 23rd in Saint Louis, MO? Great weather for outdoor activities.
Warming Trend
1.7°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 78° | 64° | 71° | 2.36" | — |
| 2024 | 76° | 66° | 71° | 2.54" | — |
| 2023 | 88° | 60° | 74° | — | — |
| 2022 | 63° | 51° | 57° | 0.08" | — |
| 2021 | 72° | 44° | 58° | — | — |
| 2020 | 78° | 55° | 67° | — | — |
| 2019 | 80° | 55° | 68° | — | — |
| 2018 | 81° | 55° | 68° | — | — |
| 2017 | 95° | 65° | 80° | — | — |
| 2016 | 90° | 67° | 78° | — | — |
| 2015 | 82° | 59° | 71° | — | — |
| 2014 | 74° | 52° | 63° | — | — |
| 2013 | 76° | 56° | 66° | — | — |
| 2012 | — | 42° | — | — | — |
| 2011 | 60° | 45° | 52° | 0.79" | — |
| 2010 | 80° | 67° | 73° | — | — |
| 2009 | 82° | 65° | 73° | — | — |
| 2008 | 87° | 57° | 72° | — | — |
| 2007 | 85° | 63° | 74° | — | — |
| 2006 | 76° | 64° | 70° | 0.56" | — |
| 2005warmest | 94° | 69° | 81° | — | — |
| 2004 | 84° | 54° | 69° | — | — |
| 2003 | 78° | 52° | 65° | — | — |
| 2002 | 70° | 44° | 57° | — | — |
| 2001 | 77° | 57° | 67° | — | — |
| 2000 | 85° | 58° | 71° | — | — |
| 1999 | 72° | 47° | 59° | — | — |
| 1998 | 72° | 54° | 63° | — | — |
| 1997 | 73° | 58° | 65° | 0.18" | — |
| 1996 | 83° | 55° | 69° | — | — |
| 1995 | 61° | 33° | 47° | — | — |
| 1994 | 67° | 49° | 58° | 0.33" | — |
| 1993 | 74° | 60° | 67° | 8" | — |
| 1992 | 67° | 44° | 55° | — | — |
| 1991 | 68° | 49° | 58° | 0.51" | — |
| 1990 | 73° | 38° | 55° | — | — |
| 1989 | 74° | 32° | 53° | — | — |
| 1988 | 87° | 57° | 72° | 0.43" | — |
| 1987 | 80° | 58° | 69° | — | — |
| 1986 | 78° | 68° | 73° | 0.66" | — |
| 1985 | 83° | 36° | 59° | 0.08" | — |
| 1982 | 70° | 42° | 56° | — | — |
| 1981 | 74° | 48° | 61° | — | — |
| 1980 | 91° | 55° | 73° | 2.79" | — |
| 1979 | 75° | 39° | 57° | — | — |
| 1978 | 71° | 46° | 59° | — | — |
| 1977 | 85° | 62° | 73° | — | — |
| 1976 | 82° | 50° | 66° | — | — |
| 1975 | 68° | 41° | 55° | — | — |
| 1974coldest | 61° | 33° | 47° | — | — |
| 1973 | 82° | 63° | 72° | 0.03" | — |
| 1972 | 70° | 59° | 64° | 0.89" | — |
| 1971 | 73° | — | — | — | — |
53 years of data from ST LOUIS ST LOUIS UNIV