St. Charles County, MO
: September 2026 so far averaged 76.6°F in St. Charles County, MO, the warmest 1 to 29 September in the county average since the data begin in 1951 (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- High
- 81.2°F
- Warmest since 2025
- 24th warmest of 76
- Low
- 52.5°F
- Warmest since 2025
- 32nd warmest of 76
No measurable precipitation in the county average of St. Charles County, MO for 2 days to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
- Normal range, 66.9 to 83.1°F
Every year as a table
Every 29 September low of the county average in St. Charles County, MO since 1951: 52.5°F in 2026; the lowest is 36.3°F, in 1951.
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 81.2 | 52.5 |
| 2025 | 88.4 | 55.6 |
| 2024 | 75.5 | 63.9 |
| 2023 | 83.6 | 62.5 |
| 2022 | 66.5 | 40.9 |
| 2021 | 89.9 | 60.9 |
| 2020 | 68.4 | 47.3 |
| 2019 | 82.7 | 66.8 |
| 2018 | 76.2 | 50.1 |
| 2017 | 75.2 | 48.7 |
| 2016 | 67 | 52.1 |
| 2015 | 82.6 | 63.8 |
| 2014 | 84.7 | 55.1 |
| 2013 | 82.9 | 55.9 |
| 2012 | 70.5 | 46.8 |
| 2011 | 74.6 | 54.3 |
| 2010 | 75.1 | 49.7 |
| 2009 | 67.5 | 47.4 |
| 2008 | 82.6 | 57.4 |
| 2007 | 83.8 | 53.7 |
| 2006 | 63.9 | 43.5 |
| 2005 | 77 | 44.8 |
| 2004 | 72.6 | 43.2 |
| 2003 | 62.1 | 38.3 |
| 2002 | 83 | 55.3 |
| 2001 | 68.6 | 43.4 |
| 2000 | 75 | 46.5 |
| 1999 | 74.2 | 51.1 |
| 1998 | 85 | 64.9 |
| 1997 | 72.8 | 53.8 |
| 1996 | 69.1 | 43.7 |
| 1995 | 79.9 | 50.4 |
| 1994 | 74.1 | 45.6 |
| 1993 | 71.7 | 42.6 |
| 1992 | 66.2 | 38.1 |
| 1991 | 80.5 | 53.3 |
| 1990 | 82.5 | 60.3 |
| 1989 | 75.2 | 41.8 |
| 1988 | 82.3 | 59 |
| 1987 | 80 | 57.8 |
| 1986 | 88.8 | 69.5 |
| 1985 | 76.3 | 47.1 |
| 1984 | 57.9 | 38.8 |
| 1983 | 82.7 | 53.5 |
| 1982 | 79.3 | 54.2 |
| 1981 | 73.7 | 49.2 |
| 1980 | 69.8 | 45.5 |
| 1979 | 87.1 | 55.2 |
| 1978 | 72 | 43.2 |
| 1977 | 73.9 | 52 |
| 1976 | 70.7 | 50.2 |
| 1975 | 72.2 | 50.6 |
| 1974 | 69.4 | 43.4 |
| 1973 | 81.1 | 59 |
| 1972 | 81.8 | 53.4 |
| 1971 | 90.2 | 69 |
| 1970 | 74.3 | 47.5 |
| 1969 | 76.9 | 50.1 |
| 1968 | 79.8 | 51.9 |
| 1967 | 60.2 | 38.1 |
| 1966 | 71.2 | 49.6 |
| 1965 | 78.6 | 51.8 |
| 1964 | 71.4 | 41.8 |
| 1963 | 78.3 | 49.5 |
| 1962 | 70.8 | 38 |
| 1961 | 72.9 | 42.3 |
| 1960 | 79.5 | 47.8 |
| 1959 | 78.4 | 54.7 |
| 1958 | 69.1 | 43.3 |
| 1957 | 72.6 | 37.3 |
| 1956 | 87.4 | 54.9 |
| 1955 | 87.6 | 62.4 |
| 1954 | 85.3 | 67.4 |
| 1953 | 100.1 | 66.1 |
| 1952 | 91.7 | 54.9 |
| 1951 | 64.3 | 36.3 |
The month
August 2026 averaged 77.2°F in St. Charles County, MO, the warmest August in the county average since 2022, tied 43rd warmest of 132 (with 2022, 1998, 1960 and 1 other year) (county average from NOAA's monthly county data, 1895 to 2026).
The month in words
- Tuesday 29 September 2026: a high of 81.2°F averaged over St. Charles County, MO, the warmest 29 September in the county average since 2025, 24th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 52.5°F averaged over St. Charles County, MO, the warmest 29 September night in the county average since 2025, 32nd warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Days of the month without a value
- 0
Nearby
St Louis, MO 16.4 mi, the nearest city with its own station