Gillette (WY) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Gillette.
Climate overview of Gillette
The climate in Gillette, Wyoming, United States of America, is marked by large temperature swings across the seasons, ranging from 31°C (88°F) in July to 1°C (34°F) in December.
The city tends toward dry conditions, with around 425 mm (17 in) of rain/snowfall per year. It does, however, have a distinct dry season from July to March, with very warm summers and very cold winters.
Gillette Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Gillette - and find the best time to visit.
Monthly Temperature in Gillette
In Gillette, temperatures differ significantly between summer and winter months. Typically, average maximum daytime temperatures range from a very warm 31°C (88°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 -10°C (14°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Gillette
Gillette typically sees modest rain/snowfall throughout the year, with an average annual precipitation of 425 mm (17 in). The climate in Gillette shows significant variation throughout the year. Expect high rainfall in May, the wettest month, with an average of 101 mm (4 in) of precipitation over 13 rainy days.
In contrast, the driest month January offers drier and sunnier days, with around 13 mm (0.5 in) of snowfall over 7 snowy days. For more details, please visit our Gillette 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 Gillette
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June and September
- Warmest weather: July and August
- Fewer rainy days: March, August, September, November and December
- Wettest months: April, May and June, when rainfall is highest.
- Seasonal pattern: A distinct dry season from July to March, with very warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -10°C (14°F).
Frequently asked questions about the climate in Gillette
What is the best time to visit Gillette?
June and September typically offer the most optimal weather in Gillette. In contrast, January, February and December tend to have less optimal conditions. Gillette has a distinct dry season from July to March, with very warm summers and very cold winters.
What temperatures can I expect in Gillette?
Daytime highs range from 1°C (34°F) in December to 31°C (88°F) in July. Nighttime lows range from -10°C (14°F) to 14°C (57°F). Temperatures vary considerably through the year.
How much rain does Gillette get?
Annual rainfall is around 425 mm (17 in). May is the wettest month with 101 mm (4 in), while January is the driest with 13 mm (0.5 in).
Gillette 3-Day Forecast
Gillette (WY) 3-Day Forecast
Gillette on the map
Gillette is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
The 10 most alternative cities in the United States
Discover the top 10 fun and alternative U.S. cities rich in art, culture, and adventure. From Portland's hippy charm to Sedona's stunning landscapes.
Sedona: Explore Majestic Red Rock Landscapes
A picturesque artists' town surrounded by red rocks and known for its spirituality, vortex energy, and stunning hikes like Cathedral Rock.
10 most idyllic villages to visit in the United States
Discover 10 idyllic villages in the USA, from California to Vermont. Explore their unique charm, rich history, stunning nature, and vibrant arts scenes.