Boulder, Montana Weather by Month

Boulder is a small town located in Jefferson County, in the southwestern part of Montana, USA. It is nestled in the Boulder River Valley, surrounded by the Elkhorn Mountains to the east and the Boulder Mountains to the west. Boulder is part of the United States and is known for its scenic beauty, rich history, and vibrant community. The town lies approximately halfway between the cities of Helena and Butte, making it a convenient stop along Interstate 15.

As of the most recent census data, Boulder has a population of approximately 1,200 residents. The town covers an area of about 1.1 square miles, offering a close-knit community atmosphere with a rural charm. Boulder is home to several historic buildings and sites, reflecting its past as a mining town in the late 19th and early 20th centuries.

One of the notable institutions in Boulder is the Montana Developmental Center, a state-operated facility providing services to individuals with developmental disabilities. The town is also known for its hot springs, which attract visitors looking to enjoy the therapeutic benefits of the mineral-rich waters. The Boulder Hot Springs Hotel and Spa is a famous landmark in the area, offering a blend of historical charm and modern amenities.

Boulder’s proximity to natural attractions such as the Elkhorn Mountains and the Boulder River makes it a popular destination for outdoor enthusiasts. Hiking, fishing, hunting, and camping are just a few of the activities that residents and visitors can enjoy in the surrounding wilderness areas.

Climate and Weather Overview

Boulder, Montana, experiences a semi-arid climate, characterized by cold, snowy winters and warm, dry summers. The climate is influenced by its elevation and location within the Rocky Mountains, which results in significant temperature variations throughout the year. The area enjoys four distinct seasons, each bringing unique weather conditions and opportunities for various activities.

Average Monthly Climate Data

Month Average Temperature (°F) Precipitation (inches) Sunny Days
January 24 0.6 15
February 28 0.5 15
March 35 0.8 18
April 45 1.0 20
May 55 1.7 22
June 64 2.2 24
July 72 1.1 27
August 71 1.1 26
September 60 1.2 22
October 48 0.9 20
November 35 0.7 15
December 25 0.6 14

Detailed Monthly Weather Overview


January in Boulder is characterized by cold temperatures and light precipitation. The average temperature hovers around 24°F, with nighttime lows often dipping below 10°F. Precipitation averages 0.6 inches, primarily in the form of snow. There are typically about 15 sunny days, offering some bright, clear days amidst the winter chill.

Natural disasters in January can include severe winter storms, which may bring heavy snowfall and strong winds, leading to hazardous driving conditions and potential power outages. Residents should be prepared with adequate winter supplies and stay updated on weather advisories.

Indoor activities are highly recommended during this month. Residents and visitors can enjoy cozy gatherings, local indoor events, or visit nearby museums and cultural sites. Outdoor enthusiasts might brave the cold for activities like ice fishing, snowshoeing, and cross-country skiing in the local parks and on the frozen lakes.


February sees a slight increase in average temperatures, rising to around 28°F. Precipitation remains light, averaging 0.5 inches, primarily as snow. The number of sunny days stays relatively constant at 15.

Severe winter storms can still occur in February, necessitating caution and preparedness. However, the cold weather provides opportunities for winter sports such as ice skating and snowmobiling.

Indoor activities remain a popular choice. Community events, indoor sports leagues, and visits to local cafés or libraries can provide warmth and entertainment.


March marks the beginning of the transition to spring, with average temperatures rising to 35°F. Precipitation increases to 0.8 inches, with a mix of snow and occasional rain. There are typically 18 sunny days, offering more opportunities for outdoor activities.

As winter wanes, the risk of severe storms decreases, but heavy snowfalls can still occur early in the month. Residents can start to enjoy outdoor walks and early spring gardening.

This month is great for both indoor and outdoor activities. Local events such as craft fairs and farmers’ markets begin to emerge, providing a taste of the warmer seasons to come.


April brings a significant warming trend, with average temperatures reaching 45°F. Precipitation averages 1.0 inch, primarily as rain, as the region fully transitions into spring. The number of sunny days rises to 20.

The risk of flooding increases with the spring thaw and increased rainfall. However, April is a beautiful month for outdoor activities, including hiking, birdwatching, and exploring local parks.

Residents and visitors can participate in outdoor festivals and enjoy the blooming flowers. It’s also a great time for picnics and family outings in the parks.


In May, temperatures continue to rise, averaging around 55°F. Precipitation increases to 1.7 inches, and there are about 22 sunny days, providing ample opportunity for outdoor activities.

The weather in May is ideal for gardening, with many residents planting their spring gardens. Outdoor activities such as cycling, hiking, and fishing become popular as the weather warms.

Local events such as farmers’ markets, community fairs, and outdoor concerts start to take place, offering a variety of activities for residents and visitors to enjoy.


June marks the beginning of summer, with average temperatures reaching 64°F. Precipitation increases to 2.2 inches, and the number of sunny days increases to 24.

June is generally a pleasant month, with warm temperatures and frequent sunny days. Outdoor activities such as swimming, boating, and picnicking are highly recommended.

The town hosts various summer events, including outdoor movies and music festivals. It’s also a great time to explore the local trails and parks, enjoying the full bloom of summer flora.


July is the warmest month in Boulder, Montana, with average temperatures around 72°F. Precipitation averages 1.1 inches, and there are typically 27 sunny days.

The warm and relatively dry weather is perfect for outdoor activities. Residents and visitors can enjoy swimming, fishing, and barbecues. It’s also a great time for hiking and exploring the local countryside.

Boulder celebrates Independence Day with a community fireworks display and various outdoor events. The warm evenings are perfect for outdoor dining and socializing.


In August, temperatures remain warm, averaging 71°F. Precipitation remains light at 1.1 inches, and there are about 26 sunny days.

The weather remains ideal for outdoor activities. Water-based activities such as kayaking and paddleboarding are popular. The local parks and trails offer great opportunities for hiking and wildlife viewing.

August is a great month for family outings and picnics. The town often hosts summer festivals and fairs, providing entertainment for all ages.


September brings slightly cooler temperatures, averaging around 60°F. Precipitation remains light at 1.2 inches, and there are typically 22 sunny days.

The transition to autumn makes September a beautiful month for outdoor activities. The cooler temperatures are perfect for hiking, biking, and enjoying the changing foliage.

Local harvest festivals and farmers’ markets become more frequent, offering fresh produce and handmade goods. It’s also a great time for scenic drives and photography.


October sees further cooling, with average temperatures around 48°F. Precipitation decreases to 0.9 inches, and there are about 20 sunny days.

The fall colors reach their peak in October, making it a popular month for outdoor activities such as leaf-peeping, hiking, and hayrides. The cooler temperatures are also ideal for apple picking and visiting pumpkin patches.

Local Halloween events and fall festivals provide entertainment and community engagement. It’s a great month for outdoor photography and enjoying the crisp autumn air.


In November, temperatures drop to an average of 35°F. Precipitation remains light at 0.7 inches, primarily as rain but occasional snowfalls can occur. There are typically 15 sunny days.

As winter approaches, outdoor activities shift towards preparation for the colder months. Residents can enjoy late-season hikes and prepare their homes and gardens for winter.

November is also a time for indoor activities and holiday preparations. Community events such as Thanksgiving dinners and craft fairs provide warmth and entertainment.


December brings the onset of winter, with average temperatures around 25°F. Precipitation remains light at 0.6 inches, primarily as snow. There are about 14 sunny days.

The holiday season brings a festive atmosphere to Boulder. Outdoor activities include ice skating, sledding, and winter walks. The town often hosts holiday events and decorations, adding to the seasonal charm.

Indoor activities such as holiday baking, crafting, and visiting local shops are popular. It’s also a time for community gatherings and enjoying the warmth of home.

Natural Disasters and Recommended Activities

While Boulder, Montana, generally experiences mild weather, it is not entirely immune to natural disasters. The most common natural threats include severe winter storms, flash flooding, and occasional wildfires during the summer and fall.

January to March

During the first three months of the year, the primary natural threats are severe winter storms, which can bring heavy snow and ice. Residents should be prepared with winter supplies and stay informed about weather conditions.

Indoor activities such as visiting local museums, attending community events, and enjoying cozy gatherings at home are recommended.

April to June

From April to June, the risk of flooding increases due to spring rains and the thawing of winter snow. Thunderstorms can also occur, bringing heavy rain and occasional hail.

Outdoor activities such as hiking, gardening, and exploring local parks are popular. Residents should stay aware of weather advisories and be prepared for sudden changes.

July to September

During the summer months, wildfires and thunderstorms are the most common natural threats, often accompanied by heavy rain and strong winds. However, these months also offer the best weather for outdoor activities.

Swimming, boating, and picnicking are highly recommended. The town hosts various summer events, providing entertainment and community engagement.

October to December

As the year comes to a close, the risk of severe weather decreases. October and November can bring occasional storms, but December typically sees the return of winter weather.

Outdoor activities such as hiking, leaf-peeping, and holiday events are popular. Residents should prepare for winter and enjoy the festive season with indoor and outdoor holiday activities.

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