Johnson County weather, town by town
20 places in Johnson County, Kansas, 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 1934 to 2025. Station extremes, not official state records.
Johnson County Weather Facts
Johnson County has 20 places on myweatherrock (20 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 114°F at Olathe Johnson Co Ind Ap on July 13, 1954. The coldest night is -19°F at Kansas City Dwtn Ap on December 22, 1989. The wettest day brought 7.45 inches of rain at Kansas City Dwtn Ap on August 15, 1969. The biggest single-day snow measured 11.5 inches at Olathe 3.3 Ene on February 2, 2011. Those are station measurements from NOAA's daily records, 1934 to 2025, not official state records. By area the largest place is Overland Park, about 75 square miles.
About Johnson County weather
The map on the Now tab shows every Johnson 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 20 Johnson 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 22°F. May is the wettest, with rain on about 11 days. January nights run from about 21°F in De Soto to 24°F in Leawood.
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.
Johnson County weather records
Measured at the NOAA stations serving these towns, daily records 1934 to 2025. Station extremes, not official state records.
Common questions about Johnson County weather
- What is the hottest temperature recorded at a Johnson County station?
- 114°F at Olathe Johnson Co Ind Ap on July 13, 1954, in the NOAA daily station records myweatherrock holds (1934 to 2025).
- What is the coldest temperature recorded at a Johnson County station?
- -19°F at Kansas City Dwtn Ap on December 22, 1989.
- What is the most rain a Johnson County station has measured in one day?
- 7.45 inches at Kansas City Dwtn Ap on August 15, 1969.
- What is the biggest one-day snowfall at a Johnson County station?
- 11.5 inches at Olathe 3.3 Ene on February 2, 2011.
- How many Johnson County towns have a weather page here?
- 20: 20 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 Johnson 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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