Weather on September 1
Saint Louis, MO
55 Years of Data
Avg High
86°F
Avg Low
65°F
Warmest
2011
88°F avg
Coldest
2009
59°F avg
About This Date
September 1st in Saint Louis, MO typically brings warm fall weather, with average highs around 86°F and lows near 65°F. Over 53 years of records, the warmest September 1st was in 2011 (88°F average), while the coldest was 2009 (59°F) — a 29°F range across recorded history. Rain or other precipitation has occurred on about 28% of September 1st dates historically, with the wettest September 1st recording 5.87" of rain. The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
The last decade has been 1.4°F cooler on this date compared to 20-30 years ago.
Planning for September 1st in Saint Louis, MO? Stay hydrated and seek shade during peak afternoon hours.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 84° | 57° | 71° | — | — |
| 2024 | 91° | 61° | 76° | — | — |
| 2023 | 85° | 52° | 68° | — | — |
| 2022 | 86° | 57° | 72° | — | — |
| 2021 | 84° | 63° | 73° | 0.03" | — |
| 2020 | 76° | 66° | 71° | 1.32" | — |
| 2019 | 82° | 69° | 76° | — | — |
| 2018 | 91° | 71° | 81° | — | — |
| 2017 | 79° | 63° | 71° | — | — |
| 2016 | 87° | 64° | 76° | 0.25" | — |
| 2015 | 91° | 73° | 82° | 3.23" | — |
| 2014 | 89° | 73° | 81° | — | — |
| 2013 | 98° | 73° | 86° | 0.84" | — |
| 2012 | 81° | 73° | 77° | 5.87" | — |
| 2011warmest | 102° | 73° | 88° | — | — |
| 2010 | 90° | 73° | 81° | 0.2" | — |
| 2009coldest | 71° | 47° | 59° | — | — |
| 2008 | 90° | 67° | 78° | — | — |
| 2007 | 83° | 56° | 69° | — | — |
| 2006 | 78° | 66° | 72° | — | — |
| 2005 | 86° | 66° | 76° | — | — |
| 2004 | 83° | 58° | 70° | — | — |
| 2003 | 86° | 71° | 79° | 0.79" | — |
| 2002 | 87° | 67° | 77° | — | — |
| 2001 | 82° | 62° | 72° | — | — |
| 2000 | 92° | 71° | 81° | — | — |
| 1999 | 81° | 55° | 68° | — | — |
| 1998 | 85° | 64° | 74° | 2.79" | — |
| 1997 | 88° | 71° | 79° | — | — |
| 1996 | 84° | 63° | 73° | — | — |
| 1995 | 91° | 69° | 80° | — | — |
| 1994 | 78° | 58° | 68° | — | — |
| 1993 | 78° | 64° | 71° | — | — |
| 1992 | 81° | 59° | 70° | — | — |
| 1991 | 89° | 70° | 79° | 0.41" | — |
| 1990 | 94° | 75° | 84° | — | — |
| 1989 | 88° | 57° | 72° | 0.81" | — |
| 1988 | 86° | 66° | 76° | — | — |
| 1987 | 78° | 52° | 65° | — | — |
| 1986 | 80° | 62° | 71° | — | — |
| 1985 | 94° | 75° | 84° | — | — |
| 1982 | 87° | 54° | 70° | 2.13" | — |
| 1981 | 91° | 68° | 80° | 3.05" | — |
| 1980 | 97° | 70° | 83° | — | — |
| 1979 | — | 69° | — | — | — |
| 1978 | 75° | 54° | 64° | — | — |
| 1977 | 91° | 69° | 80° | — | — |
| 1976 | 76° | 63° | 69° | — | — |
| 1975 | 83° | 60° | 71° | — | — |
| 1974 | — | 60° | — | 0.15" | — |
| 1973 | 92° | 68° | 80° | — | — |
| 1972 | 87° | 73° | 80° | 0.38" | — |
| 1971 | 85° | — | — | — | — |
53 years of data from ST LOUIS ST LOUIS UNIV