Boulder Average Temperature by Month

This page shows the average temperature in each month of the year in Boulder, Colorado. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Boulder?
In Boulder, Colorado, the warmest month is July, with an average daily high temperature of 87.9 °F and an average low of 57.5 °F.
What's the Coldest Month in Boulder?
In Boulder, Colorado, the coolest month is January, with an average daily high temperature of 47.0 °F and an average low of 22.1 °F.
Month Avg. High Avg. Low
January 47.0 °F 22.1 °F
February 48.0 °F 22.9 °F
March 56.7 °F 29.7 °F
April 62.7 °F 35.1 °F
May 71.1 °F 43.2 °F
June 82.2 °F 51.7 °F
July 87.9 °F 57.5 °F
August 86.0 °F 56.1 °F
September 78.7 °F 48.6 °F
October 65.8 °F 37.8 °F
November 54.3 °F 28.6 °F
December 46.2 °F 21.7 °F
Year 65.6 °F 38.0 °F
Weather Station Details
Years Station Coordinates
1893–2024 Boulder location
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