Randolph County weather, town by town
14 places in Randolph 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 1907 to 2026. Station extremes, not official state records.
Randolph County Weather Facts
Randolph County has 14 places on myweatherrock (11 villages, 3 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 112°F at Kaskaskia Rvr Navigation Lock on September 6, 1990. The coldest night is -19°F at Perryville Wtp on February 9, 1979. The wettest day brought 8.1 inches of rain at Kaskaskia Rvr Navigation Lock on December 28, 1990. 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, 1907 to 2026, not official state records. By area the largest place is Sparta, about 11 square miles.
About Randolph County weather
The map on the Now tab shows every Randolph 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 14 Randolph County towns with station normals, the warmest month is July, when the day usually reaches 91°F, and the coldest is January, when the night usually falls to 24°F. May is the wettest, with rain on about 11 days. July afternoons run from about 88°F in Rockwood to 91°F in Baldwin.
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.
Randolph County weather records
Measured at the NOAA stations serving these towns, daily records 1907 to 2026. Station extremes, not official state records.
Common questions about Randolph County weather
- What is the hottest temperature recorded at a Randolph County station?
- 112°F at Kaskaskia Rvr Navigation Lock on September 6, 1990, in the NOAA daily station records myweatherrock holds (1907 to 2026).
- What is the coldest temperature recorded at a Randolph County station?
- -19°F at Perryville Wtp on February 9, 1979.
- What is the most rain a Randolph County station has measured in one day?
- 8.1 inches at Kaskaskia Rvr Navigation Lock on December 28, 1990.
- What is the biggest one-day snowfall at a Randolph County station?
- 20 inches at Red Bud 2 S on January 31, 1982.
- How many Randolph County towns have a weather page here?
- 14: 11 villages, 3 cities. 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 Randolph 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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