Weather on September 18
Saint Louis, MO
55 Years of Data
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.
| 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" | — |
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.