Harrison County weather, town by town
12 places in Harrison 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 1893 to 2026. Station extremes, not official state records.
Harrison County Weather Facts
Harrison County has 12 places on myweatherrock (10 cities, 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 117°F at Logan 1 Wnw on July 25, 1936. The coldest night is -35°F at Logan 1 Wnw on January 12, 1912. The wettest day brought 7.1 inches of rain at Logan 1 Wnw on August 20, 2018. The biggest single-day snow measured 15 inches at Logan 1 Wnw on February 22, 1971. Those are station measurements from NOAA's daily records, 1893 to 2026, not official state records. By area the largest place is Missouri Valley, about 3 square miles.
About Harrison County weather
The map on the Now tab shows every Harrison 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 12 Harrison County towns with station normals, the warmest month is July, when the day usually reaches 86°F, and the coldest is January, when the night usually falls to 10°F. May is the wettest, with rain on about 13 days. January nights run from about 9°F in Little Sioux to 13°F in California Junction.
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.
Harrison 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 Harrison County weather
- What is the hottest temperature recorded at a Harrison County station?
- 117°F at Logan 1 Wnw on July 25, 1936, in the NOAA daily station records myweatherrock holds (1893 to 2026).
- What is the coldest temperature recorded at a Harrison County station?
- -35°F at Logan 1 Wnw on January 12, 1912.
- What is the most rain a Harrison County station has measured in one day?
- 7.1 inches at Logan 1 Wnw on August 20, 2018.
- What is the biggest one-day snowfall at a Harrison County station?
- 15 inches at Logan 1 Wnw on February 22, 1971.
- How many Harrison County towns have a weather page here?
- 12: 10 cities, 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 Harrison 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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