Weather on September 18
Saint Louis, MO
55 Years of Data
Avg High
80°F
Avg Low
57°F
Warmest
1972
85°F avg
Coldest
1991
50°F avg
About This Date
September 18th in Saint Louis, MO typically brings warm fall weather, with average highs around 80°F and lows near 57°F. Over 53 years of records, the warmest September 18th was in 1972 (85°F average), while the coldest was 1991 (50°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 26% of September 18th dates historically, with the wettest September 18th recording 4.29" of rain. The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.6°F warmer on this date compared to 20-30 years ago.
Planning for September 18th 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 |
|---|---|---|---|---|---|
| 2025 | 95° | 57° | 76° | — | — |
| 2024 | 89° | 56° | 72° | — | — |
| 2023 | 80° | 48° | 64° | — | — |
| 2022 | 88° | 62° | 75° | — | — |
| 2021 | 90° | 65° | 77° | — | — |
| 2020 | 74° | 53° | 63° | — | — |
| 2019 | 91° | 65° | 78° | — | — |
| 2018 | 94° | 68° | 81° | — | — |
| 2017 | 84° | 66° | 75° | — | — |
| 2016 | 83° | 64° | 73° | — | — |
| 2015 | 90° | 74° | 82° | — | — |
| 2014 | 68° | 58° | 63° | — | — |
| 2013 | 78° | 64° | 71° | 0.58" | — |
| 2012 | 74° | 51° | 62° | 2.21" | — |
| 2011 | 69° | 56° | 62° | 0.03" | — |
| 2010 | 81° | 57° | 69° | — | — |
| 2009 | 78° | 56° | 67° | — | — |
| 2008 | 78° | 53° | 66° | — | — |
| 2007 | 88° | 61° | 74° | — | — |
| 2006 | 85° | 59° | 72° | 3.15" | — |
| 2005 | 76° | 55° | 65° | — | — |
| 2004 | 81° | 53° | 67° | — | — |
| 2003 | 82° | 62° | 72° | — | — |
| 2002 | 73° | 64° | 69° | 2.11" | — |
| 2001 | 76° | 57° | 66° | — | — |
| 2000 | 81° | 52° | 66° | — | — |
| 1999 | 74° | 47° | 60° | — | — |
| 1998 | 77° | 65° | 71° | 0.46" | — |
| 1997 | 81° | 59° | 70° | 0.05" | — |
| 1996 | 72° | 52° | 62° | — | — |
| 1995 | 74° | 50° | 62° | — | — |
| 1994 | 80° | 54° | 67° | — | — |
| 1993 | 75° | 51° | 63° | — | — |
| 1992 | 84° | 68° | 76° | 0.13" | — |
| 1991coldest | 58° | 43° | 50° | 2.03" | — |
| 1990 | 69° | 53° | 61° | 1.96" | — |
| 1989 | 81° | 49° | 65° | — | — |
| 1988 | 89° | 69° | 79° | 0.58" | — |
| 1987 | 77° | 50° | 64° | — | — |
| 1986 | 72° | 62° | 67° | 4.29" | — |
| 1985 | 88° | 55° | 71° | — | — |
| 1982 | 84° | 58° | 71° | 1.55" | — |
| 1981 | 65° | 42° | 53° | — | — |
| 1980 | 67° | 46° | 56° | — | — |
| 1979 | 82° | 54° | 68° | — | — |
| 1978 | 93° | 75° | 84° | — | — |
| 1977 | 84° | 60° | 72° | — | — |
| 1976 | 81° | 59° | 70° | — | — |
| 1975 | 76° | 58° | 67° | — | — |
| 1974 | 80° | 56° | 68° | — | — |
| 1973 | 63° | 47° | 55° | — | — |
| 1972warmest | 98° | 71° | 85° | — | — |
| 1971 | 74° | — | — | 0.1" | — |
53 years of data from ST LOUIS ST LOUIS UNIV