average temperatures des moines iowa
Climate for Des Moines, Iowa Average Temperatures for Des Moines. Des Moines's coldest month is January when the average temperature overnight is 11.7Â°F. In July, the warmest month, the average day time temperature rises to 86.0Â°F. The driest month in Des Moines is January with 1.03 inches of precipitation, and with 4.57 inches June is the wettest month.