Dubuque Average Temperature by Month

This page shows the average temperature in each month of the year in Dubuque, Iowa. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Dubuque?
In Dubuque, Iowa, the warmest month is July, with an average daily high temperature of 81.5 °F and an average low of 62.2 °F.
What's the Coldest Month in Dubuque?
In Dubuque, Iowa, the coolest month is January, with an average daily high temperature of 26.6 °F and an average low of 11.3 °F.
Month Avg. High Avg. Low
January 26.6 °F 11.3 °F
February 30.9 °F 15.2 °F
March 44.2 °F 26.5 °F
April 57.8 °F 37.3 °F
May 69.3 °F 48.7 °F
June 78.5 °F 58.8 °F
July 81.5 °F 62.2 °F
August 79.7 °F 60.2 °F
September 73.0 °F 52.0 °F
October 59.9 °F 40.1 °F
November 44.8 °F 28.2 °F
December 31.8 °F 17.4 °F
Year 56.6 °F 38.3 °F
Weather Station Details
Years Station Coordinates
1951–2024 Dubuque Regional Airport location
1938–1950 Dubuque L&D 11 location