Iowa Weather by Month — Temperature & Rainfall Guide

Iowa is a region in the United States of America. Many people wonder what the weather conditions are in Iowa over the year. What is the best time to visit Iowa?

This page shows the average weather conditions by month in Iowa over the year in: January, February, March, April, May, June, July, August, September, October, November, December.

In January the weather in Iowa is generally poor. January is a winter month. The average maximum daytime temperatures are very low and range from -5°C (23°F) in Mason City to 1°C (34°F) in Keokuk. On average, this month is one of the coldest months of the year in Iowa. So be prepared and make sure to dress up warm.

Find more detailed climate information for Iowa in January here.

In February the weather in Iowa is generally poor. February is a winter month. The temperatures range from very low in Clear Lake with -4°C (25°F) to low in Keokuk with 2°C (36°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for Iowa in February here.

In March the weather in Iowa is generally poor. The average maximum daytime temperatures are low and range from 6°C (43°F) in Clear Lake to 11°C (52°F) in Council Bluffs.

Find more detailed climate information for Iowa in March here.

In April the weather in Iowa ranges from unpleasant in Ames to tolerable in West Des Moines. The average maximum daytime temperatures are moderate and range from 14°C (57°F) in Mason City to 18°C (64°F) in Keokuk.

Find more detailed climate information for Iowa in April here.

In May the weather in Iowa is generally pleasant. The temperatures range from pleasant in Mason City with 21°C (70°F) to high in Keokuk with 23°C (73°F).

Find more detailed climate information for Iowa in May here.

In June the weather in Iowa is generally pleasant. June is a summer month. The average maximum daytime temperatures are high and range from 26°C (79°F) in Mason City to 29°C (84°F) in Keokuk.

Find more detailed climate information for Iowa in June here.

In July the weather in Iowa ranges from tolerable in West Des Moines to perfect in Avoca. July is a summer month. The temperatures range from high in Dyersville with 28°C (82°F) to very high in Council Bluffs with 31°C (88°F). On average, this month is one of the warmest months of the year in Iowa. So be prepared and make sure to dress lightly.

Find more detailed climate information for Iowa in July here.

In August the weather in Iowa is generally pleasant. August is a summer month. The average maximum daytime temperatures are high and range from 27°C (81°F) in Mason City to 30°C (86°F) in Keokuk.

Find more detailed climate information for Iowa in August here.

In September the weather in Iowa ranges from pleasant in Ames to perfect in West Des Moines. The average maximum daytime temperatures are high and range from 23°C (73°F) in Mason City to 26°C (79°F) in Keokuk.

Find more detailed climate information for Iowa in September here.

In October the weather in Iowa ranges from tolerable in Ames to pleasant in West Des Moines. The temperatures range from moderate in Mason City with 16°C (61°F) to pleasant in Keokuk with 19°C (66°F).

Find more detailed climate information for Iowa in October here.

In November the weather in Iowa ranges from poor in West Des Moines to unpleasant in Ottumwa. The average maximum daytime temperatures are low and range from 7°C (45°F) in Mason City to 11°C (52°F) in Keokuk.

Find more detailed climate information for Iowa in November here.

In December the weather in Iowa is generally poor. December is a winter month. The temperatures range from very low in Okoboji with -2°C (28°F) to low in Keokuk with 4°C (39°F). It is a very cold month in some areas, so be prepared and make sure to dress up warm.

Find more detailed climate information for Iowa in December here.