Typical Weather in Sioux City, IA in September
78° F Avg High
53° F Avg Low
5 Rainy Days
☀️ Temperature Summary
September is a popular time to visit, with an inviting climate featuring warm temperatures. September is one of the warmer months of the year for Sioux City, with highs averaging around 78°F. You can expect overnight lows near 53°F most days. Temperatures will usually fall as the month goes on, with daily high temperatures ranging between 81°F and 70°F.
September is a great time to visit Sioux City, with mild temperatures and sunny days being very common.
High Temps Throughout the Year
🎒 What to Pack
Pick up a few of these items to keep your trip fun and comfortable.
☔ Rain Summary
In September you can expect close to a 16% chance of rain for any given day. It rains more than usual in September, with total rainfall for the month typically near 3 inches.
Rainfall Throughout the Year
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