The best times to visit Thermopolis for ideal weather are

May 28th to September 30th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.

 

 


Other Thermopolis Travel Info

Weather in Thermopolis

Temperature

Average temperatures in Thermopolis vary an incredible amount. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a very low chance of rain or snow throughout the year. The area is somewhat temperate — in the 43rd percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Thermopolis, the hottest months are July, August, and then June. See average monthly temperatures below. The warmest time of year is generally mid July where highs are regularly around 94.4°F (34.7°C) with temperatures rarely dropping below 57.6°F (14.2°C) at night.

Thermopolis Temperatures (Fahrenheit)

Key
High
Average
Low

Thermopolis Temperatures (Celsius)

Key
High
Average
Low

“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Thermopolis Perceived Temperature (F)

Key
High
Average
Low

Thermopolis Perceived Temperature (C)

Key
High
Average
Low

 

Average Thermopolis Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 30.5 16 3.9
Feb 36 21.9 10.7
Mar 54.3 37.8 24.6
Apr 61.4 45 31.2
May 70.5 54.6 40.8
Jun 83.2 66 49.9
Jul 92.9 74.6 56.7
Aug 90.3 71.3 53.7
Sep 81.2 61.5 44.4
Oct 63 46.2 32.9
Nov 46.4 30.5 18.1
Dec 30.4 16.6 5

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan -0.8 -8.9 -15.6
Feb 2.2 -5.6 -11.8
Mar 12.4 3.2 -4.1
Apr 16.3 7.2 -0.4
May 21.4 12.6 4.9
Jun 28.4 18.9 9.9
Jul 33.8 23.7 13.7
Aug 32.4 21.8 12.1
Sep 27.3 16.4 6.9
Oct 17.2 7.9 0.5
Nov 8 -0.8 -7.7
Dec -0.9 -8.6 -15

 


 

Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Thermopolis are February, December, and then January. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early January. For example, on the week of January 1st there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in late May with an average of 2 days of significant precipitation the week of May 21st.

When can you find snow in Thermopolis? Weather stations report no annual snow. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Thermopolis.

Key
Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Thermopolis (in).

Key
Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 2% 0 0.2
Feb 1% 0 0.1
Mar 2% 0 0.2
Apr 7% 0 0.7
May 19% 0 2
Jun 9% 0 1
Jul 4% 0 0.3
Aug 5% 0 0.5
Sep 6% 0 0.7
Oct 10% 0 1
Nov 4% 0 0.4
Dec 2% 0 0.2

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 2 0 0.5
Feb 1 0 0.3
Mar 2 0 0.5
Apr 7 0 1.8
May 19 0 5.1
Jun 9 0 2.5
Jul 4 0 0.8
Aug 5 0 1.3
Sep 6 0 1.8
Oct 10 0 2.5
Nov 4 0 1
Dec 2 0 0.5

 

Humidity and Wind

Thermopolis has some humid months, and dry months in the opposite season. The least humid month is July (26.6% relative humidity), and the most humid month is December (66.6%).

Wind in Thermopolis is usually calm. The windiest month is April, followed by May and March. April’s average wind speed of around 6.7 knots (7.7 MPH or 12.5 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in late March where average top sustained speeds reach 17.8 knots, which is considered a fresh breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Thermopolis.

Key
Avg. Relative Humidity

Wind

The graph below shows wind speed (max and average) in knots.

Key
Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 3.7 Barely noticeable 10.4 Gentle breeze
Feb 4 Light breeze 10.9 Gentle breeze
Mar 6 Light breeze 14.4 Gentle breeze
Apr 6.7 Light breeze 16.5 Significant breeze
May 6.2 Light breeze 15.8 Gentle breeze
Jun 5.6 Light breeze 15.1 Significant breeze
Jul 5.1 Light breeze 14.6 Gentle breeze
Aug 4.8 Light breeze 13.5 Significant breeze
Sep 4.7 Light breeze 12.5 Gentle breeze
Oct 4.5 Light breeze 11.4 Significant breeze
Nov 4.1 Light breeze 10.7 Gentle breeze
Dec 3.8 Barely noticeable 10.4 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 66%
Feb 62.5%
Mar 44.1%
Apr 38.2%
May 41.2%
Jun 33.6%
Jul 26.6%
Aug 27.8%
Sep 31.4%
Oct 47.6%
Nov 54.5%
Dec 66.6%

 

Is it Safe to Travel to Thermopolis?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for the United States; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Dec 04, 2023.


 

The Busiest and Least Crowded Months

The busiest month for tourism in Thermopolis, WY, US is July, followed by June and August. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Thermopolis in December. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month

 

Most Popular Months to Visit

Key
Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 36.5 in December means 36.5% of the tourists vs. July.

 

 

Overall Thermopolis Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 75.5°F (24.2°C) and 41.4°F (5.2°C) with warmer temperatures in the later months. Rain is rare with 1 to 6 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are quite warm. These months see moderate precipitation with 1 to 3 days of precipitation per month. June – August is the busiest season for tourism in Thermopolis, so lodging and other accommodations may cost more than usual.

Fall (September through November)

Fall daily highs range from 83.6°F (28.7°C) and 37.9°F (3.3°C), which will feel chilly given the humidity and wind. It rains or snows a normal amount: 1 to 3 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is far too cold this time of year in Thermopolis to be enjoyable for warm weather travelers. The average high during this season is between 41.4°F (5.2°C) and 26.3°F (-3.2°C). On average, it rains or snows a very small amount: 0 to 1 times per month. These times of year are the slowest with tourists.

 

Best Times to Travel› the United States › Thermopolis, WY, US