Waukesha County weather, town by town
25 places in Waukesha County, Wisconsin, 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 1893 to 2026. Station extremes, not official state records.
Waukesha County Weather Facts
Waukesha County has 25 places on myweatherrock (12 villages, 7 cities, 4 towns, 2 census-designated places), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 109°F at Waukesha Wwtp on July 14, 1936. The coldest night is -40°F at Germantown Wastewater Utility on January 10, 1982. The wettest day brought 8.76 inches of rain at W Allis on August 10, 2025. The biggest single-day snow measured 22.01 inches at Hales Corners/Whitnall Park/Bo on February 2, 2011. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is New Berlin, about 36 square miles.
About Waukesha County weather
The map on the Now tab shows every Waukesha 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 25 Waukesha County towns with station normals, the warmest month is July, when the day usually reaches 82°F, and the coldest is January, when the night usually falls to 12°F. May is the wettest, with rain on about 13 days. July afternoons run from about 81°F in Lannon to 84°F in Brookfield. January nights run from about 11°F in Chenequa to 15°F in Brookfield.
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.
Waukesha County weather records
Measured at the NOAA stations serving these towns, daily records 1893 to 2026. Station extremes, not official state records.
Common questions about Waukesha County weather
- What is the hottest temperature recorded at a Waukesha County station?
- 109°F at Waukesha Wwtp on July 14, 1936, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Waukesha County station?
- -40°F at Germantown Wastewater Utility on January 10, 1982.
- What is the most rain a Waukesha County station has measured in one day?
- 8.76 inches at W Allis on August 10, 2025.
- What is the biggest one-day snowfall at a Waukesha County station?
- 22.01 inches at Hales Corners/Whitnall Park/Bo on February 2, 2011.
- How many Waukesha County towns have a weather page here?
- 25: 12 villages, 7 cities, 4 towns, 2 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 Waukesha 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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