September weather forecast and climate
Iowa, USA

Flag of Iowa, USA
Flag of Iowa, USA

Weather in September

September is one of the best times to visit Iowa as it opens the doors to the beautiful autumn season with pleasant conditions. The summer rains recede to an average of 3" (76mm) to 4" (102mm) by early fall, and stormy weather decreases with them.
The sun is present in the sky for at least 21 days, and the sunshine lasts for daily 6 to 7 hours. Humidity drops a little compared to that during the summer though cloud cover is present from time to time.
The average high temperatures are in the 72°F (22.2°C) to 79°F (26.1°C) range, while the nights are comfortable in the average 47°F (8.3°C) to 56°F (13.3°C) zone. The oaks, maples, walnuts, and elms start to turn colors by Mid September as the beautiful fall season spreads over Iowa. North Iowa attains peak fall colors earlier than the central and southern parts. By the end of September, the landscape and scenery attain beautiful shades of colors, and the Driftless Area Scenic Byway is one of the best places to view the fall foliage!
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