Decatur County weather, town by town
10 places in Decatur 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 1894 to 2026. Station extremes, not official state records.
Decatur County Weather Facts
Decatur County has 10 places on myweatherrock (10 cities), each with its own live forecast, hourly timeline, ten day outlook and radar. The hottest day in the station records is 113°F at Lamoni on August 9, 1934. The coldest night is -33°F at Allerton on February 13, 1905. The wettest day brought 9.25 inches of rain at Allerton on August 27, 1903. The biggest single-day snow measured 17.99 inches at Lamoni on January 25, 1898. Those are station measurements from NOAA's daily records, 1894 to 2026, not official state records. By area the largest place is Lamoni, about 4 square miles.
About Decatur County weather
The map on the Now tab shows every Decatur 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 10 Decatur 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 14°F. May is the wettest, with rain on about 13 days. January nights run from about 12°F in Grand River to 16°F in Davis.
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.
Decatur County weather records
Measured at the NOAA stations serving these towns, daily records 1894 to 2026. Station extremes, not official state records.
Common questions about Decatur County weather
- What is the hottest temperature recorded at a Decatur County station?
- 113°F at Lamoni on August 9, 1934, in the NOAA daily station records myweatherrock holds (1894 to 2026).
- What is the coldest temperature recorded at a Decatur County station?
- -33°F at Allerton on February 13, 1905.
- What is the most rain a Decatur County station has measured in one day?
- 9.25 inches at Allerton on August 27, 1903.
- What is the biggest one-day snowfall at a Decatur County station?
- 17.99 inches at Lamoni on January 25, 1898.
- How many Decatur County towns have a weather page here?
- 10: 10 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 Decatur 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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