Sioux County weather, town by town
13 places in Sioux County, Iowa, 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 1895 to 2026. Station extremes, not official state records.
Sioux County Weather Facts
Sioux County has 13 places on myweatherrock (13 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 111°F at Le Mars on July 17, 1936. The coldest night is -38°F at Primghar on February 9, 1899. The wettest day brought 8.76 inches of rain at Le Mars on August 29, 1985. The biggest single-day snow measured 15.2 inches at Le Mars on January 22, 1982. Those are station measurements from NOAA's daily records, 1895 to 2026, not official state records. By area the largest place is Sioux Center, about 6 square miles.
About Sioux County weather
The map on the Now tab shows every Sioux 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 13 Sioux County towns with station normals, the warmest month is July, when the day usually reaches 85°F, and the coldest is January, when the night usually falls to 9°F. May is the wettest, with rain on about 12 days. July afternoons run from about 82°F in Matlock to 85°F in Alton. January nights run from about 6°F in Matlock to 9°F in Alton.
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.
Sioux County weather records
Measured at the NOAA stations serving these towns, daily records 1895 to 2026. Station extremes, not official state records.
Common questions about Sioux County weather
- What is the hottest temperature recorded at a Sioux County station?
- 111°F at Le Mars on July 17, 1936, in the NOAA daily station records myweatherrock holds (1895 to 2026).
- What is the coldest temperature recorded at a Sioux County station?
- -38°F at Primghar on February 9, 1899.
- What is the most rain a Sioux County station has measured in one day?
- 8.76 inches at Le Mars on August 29, 1985.
- What is the biggest one-day snowfall at a Sioux County station?
- 15.2 inches at Le Mars on January 22, 1982.
- How many Sioux County towns have a weather page here?
- 13: 13 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 Sioux 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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