Weather on September 15
Saint Louis, MO
55 Years of Data
Avg High
80°F
Avg Low
58°F
Warmest
2025
81°F avg
Coldest
2011
53°F avg
About This Date
September 15th in Saint Louis, MO typically brings warm fall weather, with average highs around 80°F and lows near 58°F. Over 53 years of records, the warmest September 15th was in 2025 (81°F average), while the coldest was 2011 (53°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 26% of September 15th dates historically, with the wettest September 15th recording 3.86" of rain. The last decade has been 4.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.4°F warmer on this date compared to 20-30 years ago.
Planning for September 15th in Saint Louis, MO? Stay hydrated and seek shade during peak afternoon hours.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025warmest | 94° | 68° | 81° | — | — |
| 2024 | 85° | 64° | 74° | 0.76" | — |
| 2023 | 82° | 44° | 63° | — | — |
| 2022 | 85° | 55° | 70° | — | — |
| 2021 | 82° | 58° | 70° | 0.05" | — |
| 2020 | 80° | 56° | 68° | — | — |
| 2019 | 92° | 62° | 77° | — | — |
| 2018 | 92° | 64° | 78° | — | — |
| 2017 | 85° | — | — | — | — |
| 2016 | 88° | 71° | 79° | — | — |
| 2015 | 81° | 61° | 71° | — | — |
| 2014 | 72° | 57° | 64° | — | — |
| 2013 | 77° | 65° | 71° | — | — |
| 2012 | 69° | 56° | 62° | — | — |
| 2011coldest | 63° | 44° | 53° | 3.86" | — |
| 2010 | 84° | 59° | 72° | — | — |
| 2009 | 80° | 62° | 71° | 0.18" | — |
| 2008 | 71° | 58° | 64° | 2.11" | — |
| 2007 | 72° | 46° | 59° | — | — |
| 2006 | 78° | 51° | 65° | — | — |
| 2005 | 76° | 64° | 70° | 3.4" | — |
| 2004 | 83° | 66° | 74° | — | — |
| 2003 | 74° | 55° | 64° | — | — |
| 2002 | 89° | 62° | 76° | 1.22" | — |
| 2001 | 74° | 52° | 63° | — | — |
| 2000 | 81° | 56° | 68° | 0.03" | — |
| 1999 | 78° | 54° | 66° | — | — |
| 1998 | 77° | 69° | 73° | 0.46" | — |
| 1997 | 85° | 67° | 76° | — | — |
| 1996 | 71° | 46° | 59° | — | — |
| 1995 | 83° | 60° | 71° | — | — |
| 1994 | 90° | 68° | 79° | — | — |
| 1993 | 57° | 51° | 54° | 0.13" | — |
| 1992 | 87° | 65° | 76° | — | — |
| 1991 | 94° | 66° | 80° | — | — |
| 1990 | 82° | 51° | 67° | — | — |
| 1989 | 60° | 55° | 58° | 0.28" | — |
| 1988 | 89° | 63° | 76° | — | — |
| 1987 | 78° | 64° | 71° | 0.08" | — |
| 1986 | 84° | 60° | 72° | — | — |
| 1985 | 75° | 44° | 60° | — | — |
| 1982 | 91° | 66° | 79° | 0.64" | — |
| 1981 | 81° | 63° | 72° | — | — |
| 1980 | 86° | 54° | 70° | — | — |
| 1979 | 70° | 41° | 55° | — | — |
| 1978 | 79° | 53° | 66° | — | — |
| 1977 | 69° | 59° | 64° | 1.57" | — |
| 1976 | 90° | 58° | 74° | — | — |
| 1975 | 72° | 41° | 56° | — | — |
| 1974 | 69° | 47° | 58° | — | — |
| 1973 | 78° | 51° | 65° | — | — |
| 1972 | 77° | 65° | 71° | — | — |
| 1971 | 102° | — | — | — | — |
53 years of data from ST LOUIS ST LOUIS UNIV