Lewistown (MT) Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Lewistown.
Climate overview of Lewistown
The climate in Lewistown, Montana, United States of America, is marked by large temperature swings across the seasons, ranging from 28°C (82°F) in July to 1°C (34°F) in December.
The city has a relatively dry climate, receiving around 498 mm (20 in) of rain/snowfall per year. It does experience a distinct dry season from November to March, with warm summers and very cold winters. May is the wettest month and February the driest.
Lewistown Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Lewistown - and find the best time to visit.
Monthly Temperature in Lewistown
In Lewistown, temperatures differ significantly between summer and winter months. On average, daytime temperatures range from a comfortable 28°C (82°F) in July to a very cold 1°C (34°F) in December.
Nighttime temperatures range from 11°C (52°F) in July to -11°C (12°F) in December.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Lewistown
Lewistown's climate is marked by below-average rain/snowfall, accumulating 498 mm (20 in) of precipitation yearly. The seasons in Lewistown bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 100 mm (3.9 in) of precipitation. This rainfall is distributed across 18 rainy days.
In contrast, the driest month, February, experiences much less snowfall, totaling 16 mm (0.6 in) over 10 snowy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Lewistown 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 Lewistown
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: June, July, August and September
- Warmest weather: July and August
- Seasonal pattern: A distinct dry season from November to March, with warm summers and very cold winters
- Coldest conditions: December, with freezing nights around -11°C (12°F).
Frequently asked questions about the climate in Lewistown
What is the best time to visit Lewistown?
June, July, August and September typically offer the most optimal weather in Lewistown. In contrast, January, February and December tend to have less optimal conditions. Lewistown has a distinct dry season from November to March, with warm summers and very cold winters.
What temperatures can I expect in Lewistown?
Daytime highs range from 1°C (34°F) in December to 28°C (82°F) in July. Nighttime lows range from -11°C (12°F) to 11°C (52°F). Temperatures vary considerably through the year.
How much rain does Lewistown get?
Annual rainfall is around 498 mm (20 in). May is the wettest month with 100 mm (3.9 in), while February is the driest with 16 mm (0.6 in).
Lewistown 3-Day Forecast
Lewistown (MT) 3-Day Forecast
Lewistown on the map
Lewistown 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.