Thermopolis (WY) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Thermopolis.
Climate overview of Thermopolis
The climate in Thermopolis, Wyoming, United States of America, is marked by large temperature swings across the seasons, ranging from 33°C (91°F) in July to 1°C (34°F) in December.
The city tends toward dry conditions, with around 313 mm (12 in) of rain/snowfall per year. It does, however, have a distinct dry season from June to April.
Thermopolis Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Thermopolis — and find the best time to visit.
Monthly Temperature in Thermopolis
In Thermopolis, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 33°C (91°F) in July to a very cold 1°C (34°F) in the coolest month, December.
Nights vary from 14°C (57°F) in July to around -13°C (9°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Thermopolis
Thermopolis's climate is marked by below-average rain/snowfall, accumulating 313 mm (12 in) of precipitation yearly. The climate in Thermopolis shows significant variation throughout the year. Expect moderate rainfall in May, the wettest month, with an average of 77 mm (3 in) of precipitation over 12 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 8.6 mm (0.3 in) of snowfall over 5 snowy days. For more details, please visit our Thermopolis Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Best Time to Visit Thermopolis
Frequently asked questions about the climate in Thermopolis
What is the best time to visit Thermopolis?
May, June and September typically offer the most optimal weather in Thermopolis. In contrast, January, February and December tend to have less optimal conditions. Thermopolis has a distinct dry season from June to April.
What temperatures can I expect in Thermopolis?
Daytime highs range from 1°C (34°F) in December to 33°C (91°F) in July. Nighttime lows range from -13°C (9°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Thermopolis get?
Annual rainfall is around 313 mm (12 in). May is the wettest month with 77 mm (3 in), while January is the driest with 8.6 mm (0.3 in).
Thermopolis 3-Day Forecast
Thermopolis (WY) 3-Day Forecast
Thermopolis on the map
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