September weather forecast and climate
Montana, USA

Flag of Montana, USA
Flag of Montana, USA

Weather in September

September transitions to the beautiful autumn season that has average high temperatures in the 60°F (15.6°C) to 70°F (21.1°C) range and the nights are relatively cooler in the average low temperature range of 35°F (1.7°C) to 45°F (7.2°C).
Summer thunderstorms sometimes extend to the early fall season, but they are mostly dry as the average rainfall rarely moves the needle beyond 1" (25mm) to 1.5" (38mm).
Sunshine is adequate as September has an average of 18 days of sunny weather.
The aspens turn yellow by Mid September as the colorful fall season spreads its wings over Montana. The Bitterroot River displays beautiful fall colors, while nearby Hamilton has a variety of trees that display shades of orange, red, and yellow against the backdrop of the panoramic Bitterroot Mountains.
Wildlife is active during the autumn, and it is an excellent idea at least to carry a bear spray as an encounter with a big one of the species is a shock but not entirely a surprise!
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