September weather forecast
Iowa, USA

September in Iowa marks the onset of autumn, a period synonymous with moderate temperatures, picturesque landscapes, and a decline in humidity levels. Daytime temperatures in September typically rest between 70°F (21.1°C) and 80°F (26.7°C), showcasing a marked decline from the summer peaks. Nights introduce a refreshing coolness, with temperatures spanning from 50°F (10°C) to 60°F (15.6°C).

As the summer rains wane, September experiences reduced precipitation. While occasional rain showers do occur, they are typically less intense than the summer thunderstorms. This reduced rainfall is complemented by an increased prevalence of clear skies, setting the stage for an array of outdoor activities.

In comparison to August, September presents a more pronounced shift towards cooler conditions. The state witnesses the foliage begin its transformation, with leaves turning various shades of amber, orange, and red. This visual spectacle, a hallmark of Iowan autumns, begins to unfold predominantly towards the latter half of the month.

Regions like Davenport, situated along the Mississippi River, may see slightly fluctuating temperatures due to the river's influence, but the onset of autumn is uniformly felt across the state. September's moderate climate and the unfolding fall colors make it an ideal month for exploration and enjoying the outdoors. It's a month where Iowa gracefully transitions from the warmth of summer to the crispness of fall, offering residents and visitors alike a visual and climatic treat.

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• Des Moines - September »
  In Des Moines, during September, the rain falls for 10.5 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Des Moines, during September, the rain falls for 10.5 days and regularly aggregates up to 1.73" (44mm) of precipitation.
• Cedar Rapids - September »
  On the first day of September in Cedar Rapids, Iowa, sunrise is at 6:32 am and sunset at 7:41 pm. In September, Cedar Rapids navigates its way towards fall with more pleasant temperatures and a decreased humidity index.
• Davenport - September »
  In Davenport during September, the rain falls for 11.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. On the last day of September, in Davenport sunrise is at 6:58 am and sunset at 6:46 pm CDT.
• Sioux City - September »
  In Sioux City in September, during 9.7 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. The start of September in Sioux City involves a subtle temperature drop, shifting from a moderately hot 81.9°F (27.7°C) in August to a still warm 75.6°F (24.2°C).
• Iowa City - September »
  In Iowa City, snow does not fall in May through September. September in Iowa City is marked by a subtle drop in average high-temperatures, transitioning from 80.6°F (27°C) in August to a still warm 75.2°F (24°C).
• Waterloo - September »
  On the last day of September, in Waterloo sunrise is at 7:05 am and sunset at 6:53 pm CDT. In Waterloo snow does not fall in June through September.
• Ames - September »
  In Ames in September, during 11.4 rainfall days, 3.03" (77mm) of precipitation is typically accumulated. September, in Ames, Iowa is characterized by the arrival of the pleasant fall season.
• West Des Moines - September »
  In West Des Moines during September, the rain falls for 11.5 days and regularly aggregates up to 2.68" (68mm) of precipitation. In West Des Moines snow does not fall in June through September.
• Council Bluffs - September »
  In Council Bluffs in September, during 12 rainfall days, 2.09" (53mm) of precipitation is typically accumulated. In Council Bluffs snow does not fall in June through September.
• Dubuque - September »
  On the first day of September in Dubuque sunrise is at 6:27 am and sunset at 7:37 pm. In Dubuque, in September, during 11.4 rainfall days, 2.6" (66mm) of precipitation is typically accumulated.
• Ankeny - September »
  In Ankeny snow does not fall in June through September. September brings in the season of fall to Ankeny accompanied by a significant change in weather patterns.
• Urbandale - September »
  On the first day of September in Urbandale sunrise is at 6:40 am and sunset at 7:48 pm. In Urbandale, Iowa, in September, during 9.7 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.