St. Louis County has 98 places on myweatherrock (70 cities, 15 villages, 11 census-designated places, 2 towns), 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 -22°F at St Louis Spirit Of St Louis Ap on December 23, 1989. The wettest day brought 8.73 inches of rain at St Louis Sci Ctr on July 26, 2022. The biggest single-day snow measured 12.99 inches at Alton - Melvin Price LandD on March 8, 1978. Those are station measurements from NOAA's daily records, 1892 to 2026, not official state records. By area the largest place is Wildwood, about 67 square miles.
About St. Louis County weather
The map on the Now tab shows every St. Louis 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 98 St. Louis County towns with station normals, the warmest month is July, when the day usually reaches 89°F, and the coldest is January, when the night usually falls to 23°F. May is the wettest, with rain on about 13 days. July afternoons run from about 87°F in Glasgow Village to 90°F in Bel-Nor. January nights run from about 21°F in Ballwin to 24°F in Affton.
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. Louis County weather records
Hottest day
116°F
Alton - Melvin Price LandD, July 10, 1946
Coldest night
-22°F
St Louis Spirit Of St Louis Ap, December 23, 1989
Wettest day
8.73 in
St Louis Sci Ctr, July 26, 2022
Biggest snow
12.99 in
Alton - Melvin Price LandD, March 8, 1978
Measured at the NOAA stations serving these towns, daily records 1892 to 2026. Station extremes, not official state records.
Common questions about St. Louis County weather
What is the hottest temperature recorded at a St. Louis 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. Louis County station?
-22°F at St Louis Spirit Of St Louis Ap on December 23, 1989.
What is the most rain a St. Louis 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. Louis County station?
12.99 inches at Alton - Melvin Price LandD on March 8, 1978.
How many St. Louis County towns have a weather page here?
98: 70 cities, 15 villages, 11 census-designated places, 2 towns. 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. Louis 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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