Yosemite National Park is definitely worth a visit
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Thermopolis (WY) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Thermopolis.
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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 two distinct dry seasons, November to April and June to September, with very warm summers and very cold winters.
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
Conditions in Thermopolis are generally most comfortable in May, June and September. They are typically least comfortable in January, February and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
cold
Feb
cold
Mar
good
Apr
good
May
excellent
Jun
excellent
Jul
good
Aug
very good
Sep
excellent
Oct
good
Nov
mixed
Dec
cold
- Best overall: May, June and September
- Warmest weather: July
- Seasonal pattern: Two distinct dry seasons, November to April and June to September, with very warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -13°C (9°F).
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 two distinct dry seasons, November to April and June to September, with very warm summers and very cold winters.
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 on the map
Thermopolis is highlighted - select any city to see its climate.
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