Temperature in Iowa in September

Daytime highs, nighttime lows and the warmest cities in Iowa, the United States of America this September.

Iowa, the United States of America, a region in the United States of America, experiences high average maximum daytime temperatures in September, ranging from 23°C (73°F) in Mason City to 26°C (79°F) in Keokuk. Nighttime temperatures generally drop to 14°C (57°F) in Keokuk and 10°C (50°F) in Mason City.

What is the temperature of the different cities in Iowa, the United States of America in September?

Curious about the September temperatures in the prime spots of Iowa? Navigate the map below and tap on a destination dot for more detailed stats.

Select a Month

Check the conditions for any month of the year.

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For a detailed overview over the year and the best time to visit Iowa, check out our Iowa's climate page.

See also: Iowa weather by month.

Best Places to Visit in Iowa in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Iowa.

Conditions Temperatures Precipitation
Avg daytime high -5°C (23°F) cold → 32°C (90°F) hot

Marker color shows the average daytime high temperature in September: blue is cold, red is hot.

See all September weather averages, cities and regions in Iowa

Iowa temperatures in September: frequently asked questions

How hot does it get in Iowa, the United States of America in September?

Daytime temperatures in West Des Moines typically peak at 25°C (77°F) in September, putting it in the high range.

How cold does it get at night in Iowa, the United States of America in September?

After dark, West Des Moines cools to about 13°C (55°F) on an average September night.

What is the warmest city in September in Iowa, the United States of America?

Data insights from our comprehensive database indicate that Keokuk is the city with the highest warmth. Daytime peaks average near 26°C (79°F), while the nights are characterized by a low temperature close to 14°C (57°F).

What is the coldest city in September in Iowa, the United States of America?

The coldest city in September in Iowa, the United States of America is Mason City when we check our database. The maximum daytime temperatures are around 23°C (73°F) and minimum nighttime temperatures fall around 10°C (50°F).

How much sun does Iowa, the United States of America get in September?

West Des Moines usually sees around 240 hours of sunlight, indicating many sunny days.

Interested in more climate information?

We have much more information about the climate in Iowa.

Weather and climate has detailed information for every country in the world. Are you going to the United States of America? Get detailed historical weather averages for many cities in the United States of America.

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