August Weather in Montana
So what is the weather like in Montana in August? In a word, delightful. Expect temperatures to range from 80-90 degrees, perhaps higher.
Do yourself a favor and pick up some wading sandals. Wet wading is the way in August. Drag along waders if you like early and late fishing or if your trip overlaps into early September.
Montana is semi-arid so don’t expect a lot of rain. It is very dry as well. Humidity can dip as low as 12%.
With the hot, dry conditions, forest fires are common in the West. Also, if conditions are severe, Montana puts hoot-owl restrictions on many of the larger rivers. Hoot-owl restriction prohibit fishing after 2 pm. So that means early morning until mid-afternoon fishing, then stopping so as not to stress the fish. With the forest flanking much of Rock Creek, seldom are hoot-owl restrictions place on the Creek but it can happen.
Sunscreen, water, and sun-shielding clothing is a must in August.