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 »
  On the first day of September sunrise is at 6:41 am and sunset at 7:47 pm. In Des Moines snow does not fall in June through September.
• Cedar Rapids - September »
  In Cedar Rapids, in September, during 10.9 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. On the first day of September in Cedar Rapids, sunrise is at 6:33 am and sunset at 7:39 pm.
• Davenport - September »
  In Davenport during September, the rain falls for 11.5 days and regularly aggregates up to 2.05" (52mm) of precipitation. Start of September in Davenport brings a slight shift in the average high-temperature, dipping a bit from August's moderately hot 80.8°F (27.1°C) to a still warm 75.4°F (24.1°C).
• Sioux City - September »
  In Sioux City, in September, it is raining for 9.7 days, with typically 1.26" (32mm) of accumulated precipitation. In Sioux City, in September, during 9.7 rainfall days, 1.26" (32mm) of precipitation is typically accumulated.
• Iowa City - September »
  In Iowa City, snow does not fall in May through September. On the first day of September in Iowa City sunrise is at 6:32 am and sunset at 7:38 pm.
• Waterloo - September »
  On the first day of September in Waterloo sunrise is at 6:35 am and sunset at 7:43 pm. In Waterloo in September, it is raining for 11.2 days, with typically 2.48" (63mm) of accumulated precipitation.
• Ames - September »
  In Ames in September, it is raining for 11.4 days, with typically 3.03" (77mm) of accumulated precipitation. On the last day of September, in Ames, sunrise is at 7:11 am and sunset at 6:57 pm CDT.
• 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, in September, during 11.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated.
• Council Bluffs - September »
  In Council Bluffs snow does not fall in June through September. On the first day of September in Council Bluffs sunrise is at 6:50 am and sunset at 7:55 pm.
• Dubuque - September »
  In Dubuque in September, during 11.4 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Dubuque, in September, during 11.4 rainfall days, 2.6" (66mm) of precipitation is typically accumulated.
• Ankeny - September »
  On the first day of September in Ankeny sunrise is at 6:41 am and sunset at 7:47 pm. In Ankeny snow does not fall in June through September.
• Urbandale - September »
  In Urbandale during September, the rain falls for 9.7 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Urbandale, snow does not fall in June through September.