St. Louis weather in October: St. Louis, Missouri: normal highs, lows, rain and records for October
St. Louis in October has a normal high of 69°F and a normal low of 49°F, a daily mean of 59°F, falling from 75°F on the 1st to 63°F by the 31st. Measurable precipitation falls on 9 days in a normal October, 3.15 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 21°C and low of 10°C, 80 mm of precipitation in October.
- NOAA stationSt Louis Lambert International Airport
- Station IDUSW00013994
- Location38.75°N 90.37°W
- Elevation531 ft (162 m)
- From the center11 miles
- Population279,695
- Jan 40° 24°
- Feb 46° 28°
- Mar 57° 37°
- Apr 68° 47°
- May 77° 58°
- Jun 86° 67°
- Jul 90° 71°
- Aug 88° 69°
- Sep 81° 61°
- Oct 69° 49°
- Nov 56° 37°
- Dec 45° 29°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is St. Louis in October?
The normal high is 69°F and the normal low 49°F, for a daily mean of 59.1°F. October is 11.9°F cooler than September and 12.6°F warmer than November. October is the 6th warmest month of the year in St. Louis and the 8th wettest. Across the month the normal high falls 12°F, from 75°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 57°F and 62°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 30%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 75°F | 55°F | 25% | 16% |
| October 8 | 73°F | 52°F | 26% | 17% |
| October 15 | 70°F | 50°F | 27% | 17% |
| October 22 | 67°F | 47°F | 28% | 18% |
| October 31 | 63°F | 43°F | 30% | 18% |
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 | 75°F | 55°F | 25% | 16% | 11 h 50 min |
| October 2 | 75°F | 55°F | 25% | 16% | 11 h 50 min |
| October 3 | 75°F | 54°F | 25% | 16% | 11 h 50 min |
| October 4 | 74°F | 54°F | 25% | 16% | 11 h 40 min |
| October 5 | 74°F | 53°F | 25% | 16% | 11 h 40 min |
| October 6 | 74°F | 53°F | 25% | 16% | 11 h 40 min |
| October 7 | 73°F | 53°F | 26% | 16% | 11 h 40 min |
| October 8 | 73°F | 52°F | 26% | 17% | 11 h 30 min |
| October 9 | 72°F | 52°F | 26% | 17% | 11 h 30 min |
| October 10 | 72°F | 51°F | 26% | 17% | 11 h 30 min |
| October 11 | 71°F | 51°F | 27% | 17% | 11 h 30 min |
| October 12 | 71°F | 51°F | 27% | 17% | 11 h 20 min |
| October 13 | 71°F | 50°F | 27% | 17% | 11 h 20 min |
| October 14 | 70°F | 50°F | 27% | 17% | 11 h 20 min |
| October 15 | 70°F | 50°F | 27% | 17% | 11 h 20 min |
| October 16 | 69°F | 49°F | 27% | 18% | 11 h 10 min |
| October 17 | 69°F | 49°F | 28% | 18% | 11 h 10 min |
| October 18 | 68°F | 48°F | 28% | 18% | 11 h 10 min |
| October 19 | 68°F | 48°F | 28% | 18% | 11 h 10 min |
| October 20 | 68°F | 48°F | 28% | 18% | 11 h |
| October 21 | 67°F | 47°F | 28% | 18% | 11 h |
| October 22 | 67°F | 47°F | 28% | 18% | 11 h |
| October 23 | 66°F | 46°F | 29% | 18% | 11 h |
| October 24 | 66°F | 46°F | 29% | 18% | 10 h 50 min |
| October 25 | 65°F | 46°F | 29% | 18% | 10 h 50 min |
| October 26 | 65°F | 45°F | 29% | 18% | 10 h 50 min |
| October 27 | 64°F | 45°F | 29% | 18% | 10 h 50 min |
| October 28 | 64°F | 44°F | 29% | 18% | 10 h 40 min |
| October 29 | 64°F | 44°F | 29% | 18% | 10 h 40 min |
| October 30 | 63°F | 44°F | 30% | 18% | 10 h 40 min |
| October 31 | 63°F | 43°F | 30% | 18% | 10 h 40 min |
- Normal high
- 69°FOctober average
- Normal low
- 49°FOctober average
- Precipitation
- 3.15 inmonth total
- Days with precipitation
- 90.01 inch or more
- Nights at 32°F or colder
- 1
- Daylight
- 11 h 50 min to 10 h 40 minOctober 1 to October 31
- Days at 70°F or more
- 16
- Days at 80°F or more
- 6
- Sunshine
- 76%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013994; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in St. Louis in October?
On a given October day the chance of 0.01 inch or more is 27% on average, highest around October 31 (30%). In all, 3.15 in falls on 9 days of a normal October, 1 of them with an inch or more.
In a normal October in St. Louis, 1 nights fall to freezing.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013994.
How humid and windy is St. Louis in October?
At 3 p.m. the normal temperature is 60°F with 49% relative humidity and a dew point of 40°F; at 6 a.m. it is 47°F with 77% humidity. The wind averages 8.9 mph, most often from the west-southwest in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 47°F | 40°F | 77% | 7.5 mph | 36% |
| 9 a.m. | 52°F | 41°F | 67% | 9.9 mph | 36% |
| noon | 57°F | 41°F | 54% | 10.9 mph | 29% |
| 3 p.m. | 60°F | 40°F | 49% | 11.1 mph | 31% |
| 6 p.m. | 55°F | 40°F | 57% | 8.8 mph | 30% |
| 9 p.m. | 52°F | 40°F | 64% | 8.6 mph | 46% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013994. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for October in St. Louis?
The warmest October temperature on St. Louis's official record (since 1874) is 94°F, on October 2, 1953; the coldest is 21°F, on October 30, 1925. The wettest October brought 12.38 in (2009).
The October mean against the 1991-2020 normal of 59.1°F: 2021 63.9°F (+4.8), 2022 58.7°F (−0.4), 2023 61.2°F (+2.1), 2024 63.5°F (+4.4), 2025 63.4°F (+4.3). 4 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.9°F | +4.8°F | 2.62 in |
| 2022 | 58.7°F | −0.4°F | 3.68 in |
| 2023 | 61.2°F | +2.1°F | 2.21 in |
| 2024 | 63.5°F | +4.4°F | 0.82 in |
| 2025 | 63.4°F | +4.3°F | 3.20 in |
Source: records: ACIS, NWS threaded record STLthr; recent months: ACIS, station USW00013994. Records and recent months use complete months only.
How does October in St. Louis 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. Louis's is 69°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.