Sioux City Average Temperature by Month

This page shows the average temperature in each month of the year in Sioux City, Iowa. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Sioux City?
In Sioux City, Iowa, the warmest month is July, with an average daily high temperature of 85.7 °F and an average low of 63.7 °F.
What's the Coldest Month in Sioux City?
In Sioux City, Iowa, the coolest month is January, with an average daily high temperature of 30.0 °F and an average low of 10.7 °F.
Month Avg. High Avg. Low
January 30.0 °F 10.7 °F
February 34.8 °F 15.0 °F
March 48.3 °F 26.1 °F
April 61.7 °F 36.9 °F
May 72.9 °F 49.1 °F
June 82.6 °F 59.8 °F
July 85.7 °F 63.7 °F
August 83.3 °F 61.1 °F
September 77.2 °F 51.4 °F
October 63.4 °F 38.2 °F
November 47.4 °F 25.2 °F
December 34.0 °F 15.1 °F
Year 60.2 °F 37.8 °F
Weather Station Details
Years Station Coordinates
1948–2024 Sioux City Gateway Airport location
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