Weather history and climate summary information is available for the following locations:
- Des Moines
- Sioux City
Warmest August Days
The warmest August days in Iowa are:
| Des Moines, Iowa | 1983 | 108°F |
| Des Moines, Iowa | 1988 | 104°F |
| Sioux City, Iowa | 1994 | 102.9°F |
| Sioux City, Iowa | 1988 | 102°F |
| Sioux City, Iowa | 2012 | 102°F |
Coldest August Days
The coldest August days in Iowa were:
| Sioux City, Iowa | 1986 | 39°F |
| Des Moines, Iowa | 1986 | 41°F |
| Sioux City, Iowa | 2012 | 42.8°F |
| Sioux City, Iowa | 2004 | 43°F |
| Sioux City, Iowa | 1992 | 45°F |
Wettest August Days
The wettest single days in August occurred:
| Des Moines, Iowa | 1977 | 4.7 inches |
| Des Moines, Iowa | 1993 | 4 inches |
| Sioux City, Iowa | 2007 | 3.7 inches |
| Sioux City, Iowa | 1993 | 3.5 inches |
| Des Moines, Iowa | 2010 | 3.4 inches |