O'Fallon Weather in October
Average highs run from 75°F on October 1 to 62°F on October 31, and lows from 51°F to 40°F. Normal precipitation for the month is 3.11 in over about 8 wet days.
October day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
October at a glance
- Average high
- 69°F
- Average low
- 45°F
- Precipitation
- 3.11 in
- Record high
- 94°FOct 3, 2006
- Record low
- 23°FOct 19, 2022
- Chance of a freeze
- 73%
- Daylight
- 11 h 46 min to 10 h 34 min
- Cloud cover
- 54%
- Humidity
- 71%
- Dew point
- 46°F
- Wind
- 8.3 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Oct 1 | 75°F | 51°F | 93°F 2019 | 37°F 2022 | 25% | 0% |
| Oct 2 | 74°F | 50°F | 93°F 2006 | 33°F 2003 | 25% | 0% |
| Oct 3 | 74°F | 50°F | 94°F 2006 | 34°F 1987 | 25% | 0% |
| Oct 4 | 74°F | 50°F | 91°F 2006 | 33°F 1987 | 25% | 0% |
| Oct 5 | 73°F | 49°F | 91°F 2007 | 30°F 2020 | 25% | 0% |
| Oct 6 | 73°F | 49°F | 89°F 2007 | 31°F 1988 | 25% | 0% |
| Oct 7 | 72°F | 49°F | 92°F 2007 | 30°F 2000 | 25% | 0% |
| Oct 8 | 72°F | 48°F | 90°F 2007 | 30°F 2000 | 25% | 0% |
| Oct 9 | 72°F | 48°F | 86°F 2010 | 28°F 2000 | 25% | 0% |
| Oct 10 | 71°F | 47°F | 88°F 2021 | 28°F 2000 | 26% | 0% |
| Oct 11 | 71°F | 47°F | 85°F 1989 | 31°F 2000 | 26% | 0% |
| Oct 12 | 70°F | 47°F | 86°F 2024 | 28°F 1987 | 26% | 0% |
| Oct 13 | 70°F | 46°F | 89°F 1989 | 28°F 2006 | 26% | 0% |
| Oct 14 | 69°F | 46°F | 89°F 2017 | 29°F 2006 | 26% | 0% |
| Oct 15 | 69°F | 46°F | 86°F 1989 | 32°F 2020 | 26% | 0% |
| Oct 16 | 69°F | 45°F | 86°F 2016 | 28°F 2020 | 26% | 0% |
| Oct 17 | 68°F | 45°F | 89°F 2016 | 29°F 2001 | 26% | 0% |
| Oct 18 | 68°F | 44°F | 84°F 2016 | 28°F 1999 | 27% | |
| Oct 19 | 67°F | 44°F | 82°F 2003 | 23°F 2022 | 27% | |
| Oct 20 | 67°F | 44°F | 88°F 2003 | 26°F 2022 | 27% | |
| Oct 21 | 66°F | 43°F | 86°F 2015 | 27°F 2018 | 27% | |
| Oct 22 | 66°F | 43°F | 85°F 2020 | 31°F 2013 | 27% | |
| Oct 23 | 66°F | 43°F | 84°F 2010 | 28°F 2006 | 27% | |
| Oct 24 | 65°F | 42°F | 84°F 2012 | 24°F 2006 | 27% | |
| Oct 25 | 65°F | 42°F | 84°F 2011 | 23°F 2013 | 28% | |
| Oct 26 | 64°F | 42°F | 80°F 2000 | 29°F 1990 | 28% | |
| Oct 27 | 64°F | 41°F | 83°F 2014 | 26°F 2013 | 28% | |
| Oct 28 | 63°F | 41°F | 83°F 1999 | 26°F 2008 | 28% | |
| Oct 29 | 63°F | 41°F | 85°F 2004 | 24°F 2017 | 29% | |
| Oct 30 | 62°F | 40°F | 82°F 1987 | 25°F 2023 | 29% | |
| Oct 31 | 62°F | 40°F | 81°F 1999 | 23°F 2023 | 29% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- October 1
- sunrise 6:59 AM, sunset 6:45 PM
- October 31
- sunrise 7:29 AM, sunset 6:03 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00237475 (St Peters 2 Se), public domain. Records: NOAA GHCN-Daily, station USW00003966, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.