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.
Thermopolis Travel Guide
Other Thermopolis Travel Info
Weather in Thermopolis
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)
Thermopolis Temperatures (Celsius)
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)
Thermopolis Perceived Temperature (C)
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.
|Month||Avg. High (°F)||Avg. Mean (°F)||Avg. Low (°F)|
|Month||Avg. High (°C)||Avg. Mean (°C)||Avg. Low (°C)|
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.
Snow on the Ground
The graph below shows the average snow on the ground in Thermopolis (in).
Average Rain and Snow by Month
|Month||Daily Chance of Rain||Average Snow Depth (in)||Total Precipitation (in)|
|Month||Daily Chance of Rain||Average Snow Depth (cm)||Total Precipitation (cm)|
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.
The graph below shows wind speed (max and average) in knots.
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|
Is it Safe to Travel to Thermopolis?
Our best data indicates this area is generally safe. As of Oct 07, 2019 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 Sep 23, 2019.
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
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.