Bozeman Weather

Bozeman weather is variable with conditions changing frequently. Storms from the Pacific can bring spring deluges while southern dips in the Jet Stream are followed by arctic blasts. The mixed topography of Southwest Montana adds to the weather variability at a localized level. Guides carefully review weather predictions to help decide which fisheries to target on our Bozeman fly fishing trips.

Spring in Bozeman usually starts in March, bringing warmer temperatures as they climb into the 50s. However, the weather can be unpredictable, with cold fronts being common in March and April, and overnight lows occasionally dipping below freezing.

Bozeman fly fishing begins to be more consistent this time of the year as the weather patterns become less variable.

Snow showers are frequent early in spring, and significant snowfall can occur into April. By the end of April, the weather becomes more stable, with highs reaching the 60s and lows in the 30s and 40s.

The warming weather triggers blue-winged olive and the Mother’s Day Caddis hatches in late April. Montana fishing picks up significantly in late April and it can be one of the best times of the year for Bozeman fly fishing

However, this season is also known for being windy, with frequent breezes of 15-25 mph that can drive wind chills down. The skies tend to be cloudier as Pacific fronts bring more stormy weather.

By May, the daytime highs average in the 60s, and nights in the 40s as the spring rainy season comes to an end. Montana rivers begin to swell with water from melting snow and spring rains by mid-May.

During the summer months, which usually arrive by June, Bozeman experiences its warmest weather of the year. However, due to its high altitude, even summer temperatures in Bozeman can be relatively mild compared to lower elevations.

Salmonfly hatches and summer streamer fly fishing in Montana peak in late June as the high water begins to recede.

In July and August, the average daytime temperatures range from the 80s, with warmer spells pushing temperatures into the 90s. Anglers fishing large hopper or attractor dry flies can expect enjoyable days floating the Yellowstone River.

The evenings cool quickly after sunset, with overnight lows dropping into the 40s or 50s. The low humidity makes the heat much more bearable.

Although the skies are usually sunny, afternoon and evening thundershowers are common as moisture increases. These passing storms are often accompanied by lightning and gusty winds. Overnight thunderstorms with heavy rain are also possible, especially in July.

As September arrives, high temperatures recede into the 70s, and the leaves begin changing colors in the later season. The water temperatures of the blue-ribbon trout fishing rivers near Bozeman lower and stabilize, creating consistent subsurface fishing.

Fall is a delightful season in Bozeman, where the days are mostly sunny and clear, with cool and crisp evenings. September is still warm, with temperatures averaging in the 70s, but the nights become cooler.

October brings a substantial drop in temperatures, with highs in the 50s, and occasional light snow at higher elevations. Streamer fly fishing is now the preferred angling technique for advanced anglers looking for the legendary trophy Brown Trout of Montana.

Cold snaps are common during this period. By late October, expect overnight lows in the 20s, which will require warmer attire. Fins and Feathers Bozeman fly fishing guides start to prepare for winter as guided trip bookings drop off in late October.

November is much colder, with daytime highs in the 30s and 40s. The first snowstorms usually arrive by early November, marking the beginning of winter.

Bozeman residents are well aware of the long winter season that spans from December through March. Winters in Bozeman usually have plenty of sunshine. However, temperatures frequently remain below freezing throughout the day.

Although there are winter opportunities to fly fish in Montana, it is best to check the weather and wait until a few days before the anticipated fishing date to book a winter guide trip with our Bozeman fly fishing guides.

At any time, bitterly cold Arctic air can grip Bozeman, resulting in wind chills below zero. On sunny days, the average high temperatures in winter peak just below freezing near 30 degrees.

Expect the overnight lows to frequently drop to zero or below.

The snowfall varies each year, and during heavier seasons, it can reach up to 100 inches. From January through March, mountain passes close due to heavy snow and avalanche risks. Blizzards with intense "snow events" and blowing and drifting snow are also frequent. Snowy and icy conditions last from November through April.

Montana Fishing Reports


Gallatin River

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Fly fishing in Montana on the Madison River during spring can be some of the best fly fishing in the state. The water temperatures start to rise, and the trout's...

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The Madison River fly fishing during the spring months can be some of the best fly fishing in Montana. Close to Bozeman, MT, the lower stretches (Ennis Dam north to...

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