Average Rainfall for Wyoming in August

The tables below give monthly averages for rainfall during August at cities, towns and parks in Wyoming.

Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The rainfall totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

You can jump to a separate table for each region of the state: Northwest, Southwest, North - Central, Northeast and Southeast Wyoming.

Northwest Wyoming

Average monthly precipitation in August

Days	Place	Inches	Milli­metres
6	Alta	1.4	35
7	Cody	0.9	23
8	Jackson	1.1	29
9	Moose	1.2	31
8	Moran	1.3	33
10	Yellowstone Lake	1.5	38
9	Yellowstone Park, Mammoth	1.1	27
9	Yellowstone Park, Old Faithful	1.4	36
9	Yellowstone Park, South Entrance	1.6	41

Southwest Wyoming

August averages for total rainfall

Days	Place	Inches	Milli­metres
6	Evanston	1.1	28
6	Fontenelle Reservoir Dam	0.7	19
7	Fossil Butte Monument	0.9	23
4	Kemmerer	0.9	22
6	Rock Springs	0.6	14

North - Central Wyoming

Average amount of rain in August

Days	Place	Inches	Milli­metres
4	Boysen Reservoir Dam	0.5	12
5	Lander	0.5	13
5	Riverton	0.5	11
5	Ten Sleep	0.8	19
4	Thermopolis	0.5	13
5	Worland	0.4	10

Northeast Wyoming

Precipitation totals for August

Days	Place	Inches	Milli­metres
6	Buffalo	0.8	19
6	Devils Tower	1.9	48
6	Gillette	1.4	35
6	Sheridan	0.7	18
7	Sundance	1.7	43

Southeast Wyoming

Total precipitation during August

Days	Place	Inches	Milli­metres
6	Casper	0.8	20
10	Cheyenne	1.5	39
6	Douglas	1.0	25
10	Laramie	1.1	27
6	Rawlins	0.7	19
6	Torrington	1.2	30