Thermopolis Average Temperature by Month

This page shows the average temperature in each month of the year in Thermopolis, Wyoming. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Thermopolis?
In Thermopolis, Wyoming, the warmest month is July, with an average daily high temperature of 91.8 °F and an average low of 57.1 °F.
What's the Coldest Month in Thermopolis?
In Thermopolis, Wyoming, the coolest month is January, with an average daily high temperature of 37.3 °F and an average low of 11.5 °F.
Month Avg. High Avg. Low
January 37.3 °F 11.5 °F
February 41.6 °F 15.6 °F
March 54.0 °F 25.6 °F
April 61.8 °F 33.4 °F
May 71.4 °F 42.5 °F
June 82.9 °F 50.6 °F
July 91.8 °F 57.1 °F
August 89.8 °F 55.0 °F
September 79.7 °F 45.7 °F
October 64.5 °F 33.8 °F
November 48.5 °F 21.7 °F
December 37.5 °F 12.3 °F
Year 63.5 °F 33.9 °F
Weather Station Details
Years Station Coordinates
1899–2024 Thermopolis location
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