St. Charles County weather, town by town
18 places in St. Charles County, Missouri, each with its own live forecast and radar, and where a station sits close enough, measured weather records.
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Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
St. Charles County Weather Facts
St. Charles County has 18 places on myweatherrock (14 cities, 2 towns, 1 census-designated places, 1 villages), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 116°F at Alton - Melvin Price LandD on July 10, 1946. The coldest night is -28°F at Weldon Spring Nws on December 23, 1989. The wettest day brought 10.88 inches of rain at St Peters 2 Se on July 26, 2022. The biggest single-day snow measured 15 inches at Warrenton 1 N on March 24, 1912. Those are station measurements from NOAA's daily records, 1892 to 2026, not official state records. By area the largest place is O'Fallon, about 31 square miles.
About St. Charles County weather
The map on the Now tab shows every St. Charles County town's current temperature from our own server, one dot per town. Tap any dot, or type a town above, for that town's full forecast.
What the weather is usually like
Across the 18 St. Charles County towns with station normals, the warmest month is July, when the day usually reaches 88°F, and the coldest is January, when the night usually falls to 22°F. May is the wettest, with rain on about 12 days.
Means of the 1991 to 2020 station normals serving these towns, as published by NOAA; each town's page carries its own.
Where these numbers come from
- Current conditions and forecast: NOAA forecast grids decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
- Records: computed by myweatherrock from NOAA GHCN-Daily station records at the stations serving these towns. Measurements, not estimates.
- Warnings and alerts: the National Weather Service, passed through unchanged.
St. Charles County weather records
Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
Common questions about St. Charles County weather
- What is the hottest temperature recorded at a St. Charles County station?
- 116°F at Alton - Melvin Price LandD on July 10, 1946, in the NOAA daily station records myweatherrock holds (1892 to 2026).
- What is the coldest temperature recorded at a St. Charles County station?
- -28°F at Weldon Spring Nws on December 23, 1989.
- What is the most rain a St. Charles County station has measured in one day?
- 10.88 inches at St Peters 2 Se on July 26, 2022.
- What is the biggest one-day snowfall at a St. Charles County station?
- 15 inches at Warrenton 1 N on March 24, 1912.
- How many St. Charles County towns have a weather page here?
- 18: 14 cities, 2 towns, 1 census-designated places, 1 villages. Each page carries current conditions, the hourly timeline, the ten day outlook, radar, and where a station sits close enough, measured records.
- Where does the St. Charles County forecast come from?
- NOAA forecast grids (the National Weather Service digital forecast, the National Blend of Models, HRRR and GFS) decoded on our own server, corrected against the nearest reporting station and our own radar. Open-Meteo is consulted only as a fallback when our server is silent.
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