St. Clair County weather, town by town
31 places in St. Clair County, Illinois, 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 1948 to 2025. Station extremes, not official state records.
St. Clair County Weather Facts
St. Clair County has 31 places on myweatherrock (19 villages, 7 cities, 5 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 110°F at Belleville Siu Rsch on July 14, 1954. The coldest night is -27°F at Belleville Siu Rsch on January 17, 1977. The wettest day brought 8.73 inches of rain at St Louis Sci Ctr on July 26, 2022. The biggest single-day snow measured 20 inches at Red Bud 2 S on January 31, 1982. Those are station measurements from NOAA's daily records, 1948 to 2025, not official state records. By area the largest place is Belleville, about 23 square miles.
About St. Clair County weather
The map on the Now tab shows every St. Clair 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 31 St. Clair County towns with station normals, the warmest month is July, when the day usually reaches 90°F, and the coldest is January, when the night usually falls to 24°F. May is the wettest, with rain on about 13 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. Clair County weather records
Measured at the NOAA stations serving these towns, daily records 1948 to 2025. Station extremes, not official state records.
Common questions about St. Clair County weather
- What is the hottest temperature recorded at a St. Clair County station?
- 110°F at Belleville Siu Rsch on July 14, 1954, in the NOAA daily station records myweatherrock holds (1948 to 2025).
- What is the coldest temperature recorded at a St. Clair County station?
- -27°F at Belleville Siu Rsch on January 17, 1977.
- What is the most rain a St. Clair County station has measured in one day?
- 8.73 inches at St Louis Sci Ctr on July 26, 2022.
- What is the biggest one-day snowfall at a St. Clair County station?
- 20 inches at Red Bud 2 S on January 31, 1982.
- How many St. Clair County towns have a weather page here?
- 31: 19 villages, 7 cities, 5 census-designated places. 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. Clair 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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