St. Charles weather in October: St. Charles, Missouri: normal highs, lows, rain and records for October
St. Charles in October has a normal high of 69°F and a normal low of 46°F, a daily mean of 58°F, falling from 76°F on the 1st to 63°F by the 31st. Measurable precipitation falls on 10 days in a normal October, 2.66 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 8°C, 68 mm of precipitation in October.
- NOAA stationSt Charles County Airport
- Station IDUSW00053904
- Location38.93°N 90.43°W
- Elevation436 ft (133 m)
- Population72,458
- Jan 40° 22°
- Feb 45° 26°
- Mar 56° 34°
- Apr 68° 45°
- May 77° 56°
- Jun 86° 65°
- Jul 89° 68°
- Aug 88° 66°
- Sep 81° 57°
- Oct 69° 46°
- Nov 55° 35°
- Dec 44° 27°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Charles in October?
The normal high is 69°F and the normal low 46°F, for a daily mean of 57.5°F. October is 11.6°F cooler than September and 12.5°F warmer than November. October is the 6th warmest month of the year in St. Charles and the 9th wettest. Across the month the normal high falls 13°F, from 76°F on October 1 to 63°F on October 31. From one year to the next October's mean temperature typically moves about 2.4°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 55°F and 60°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 76°F | 51°F | 32% | 16% |
| October 8 | 73°F | 49°F | 32% | 17% |
| October 15 | 70°F | 46°F | 31% | 17% |
| October 22 | 67°F | 44°F | 30% | 17% |
| October 31 | 63°F | 40°F | 29% | 17% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 76°F | 51°F | 32% | 16% | 11 h 50 min |
| October 2 | 75°F | 51°F | 32% | 16% | 11 h 50 min |
| October 3 | 75°F | 51°F | 32% | 16% | 11 h 50 min |
| October 4 | 75°F | 50°F | 32% | 16% | 11 h 40 min |
| October 5 | 74°F | 50°F | 32% | 16% | 11 h 40 min |
| October 6 | 74°F | 50°F | 32% | 17% | 11 h 40 min |
| October 7 | 73°F | 49°F | 32% | 17% | 11 h 30 min |
| October 8 | 73°F | 49°F | 32% | 17% | 11 h 30 min |
| October 9 | 72°F | 49°F | 31% | 17% | 11 h 30 min |
| October 10 | 72°F | 48°F | 31% | 17% | 11 h 30 min |
| October 11 | 72°F | 48°F | 31% | 17% | 11 h 30 min |
| October 12 | 71°F | 47°F | 31% | 17% | 11 h 20 min |
| October 13 | 71°F | 47°F | 31% | 17% | 11 h 20 min |
| October 14 | 70°F | 47°F | 31% | 17% | 11 h 20 min |
| October 15 | 70°F | 46°F | 31% | 17% | 11 h 20 min |
| October 16 | 69°F | 46°F | 31% | 17% | 11 h 10 min |
| October 17 | 69°F | 46°F | 31% | 17% | 11 h 10 min |
| October 18 | 69°F | 45°F | 30% | 17% | 11 h 10 min |
| October 19 | 68°F | 45°F | 30% | 17% | 11 h 10 min |
| October 20 | 68°F | 44°F | 30% | 17% | 11 h |
| October 21 | 67°F | 44°F | 30% | 17% | 11 h |
| October 22 | 67°F | 44°F | 30% | 17% | 11 h |
| October 23 | 66°F | 43°F | 30% | 17% | 11 h |
| October 24 | 66°F | 43°F | 30% | 17% | 10 h 50 min |
| October 25 | 65°F | 42°F | 30% | 17% | 10 h 50 min |
| October 26 | 65°F | 42°F | 29% | 17% | 10 h 50 min |
| October 27 | 64°F | 42°F | 29% | 17% | 10 h 50 min |
| October 28 | 64°F | 41°F | 29% | 17% | 10 h 40 min |
| October 29 | 64°F | 41°F | 29% | 17% | 10 h 40 min |
| October 30 | 63°F | 40°F | 29% | 17% | 10 h 40 min |
| October 31 | 63°F | 40°F | 29% | 17% | 10 h 40 min |
- Normal high
- 69°FOctober average
- Normal low
- 46°FOctober average
- Precipitation
- 2.66 inmonth total
- Days with precipitation
- 100.01 inch or more
- Nights at 32°F or colder
- 2
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 15
- Days at 80°F or more
- 6
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00053904; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Charles in October?
On a given October day the chance of 0.01 inch or more is 31% on average, highest around October 1 (32%). In all, 2.66 in falls on 10 days of a normal October, 1 of them with an inch or more.
In a normal October in St. Charles, 2 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00053904.
What are the records for October in St. Charles?
The October mean against the 1991-2020 normal of 57.5°F: 2021 62.8°F (+5.3), 2022 55.9°F (−1.6), 2023 57.8°F (+0.3), 2024 60.2°F (+2.7), 2025 61.6°F (+4.1). 4 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 62.8°F | +5.3°F | 3.16 in |
| 2022 | 55.9°F | −1.6°F | 3.29 in |
| 2023 | 57.8°F | +0.3°F | 2.38 in |
| 2024 | 60.2°F | +2.7°F | 0.67 in |
| 2025 | 61.6°F | +4.1°F | 1.85 in |
Source: recent months: ACIS, station USW00053904. Records and recent months use complete months only.
How does October in St. Charles compare across Missouri?
Across the 134 places PlainClimate covers in Missouri, October normal highs run from 64°F in Green City to 74°F in Malden; St. Charles's is 69°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.
Other months and places
- St. Charles in September81°F by day, 57°F at night
- St. Charles in November55°F by day, 35°F at night
- St. Charles through the yearEvery month, frost dates, records and recent years
- Missouri in OctoberThe statewide normal and the warmest and coolest places
- Malden: Missouri's warmest Octobernormal high 74°F