Average August Temperatures for Idaho

Average temperatures for August at cities, towns, parks and lakes throughout Idaho are listed below in degrees Fahrenheit and Celsius.

You can jump to a separate table for each region of the state: Eastern, Central, Southwestern and Northern Idaho.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Eastern Idaho

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
82	46	Driggs	28	8
86	48	Idaho Falls	30	9
77	40	Island Park	25	4
88	50	Malad City	31	10
89	57	Pocatello	31	14
87	52	Preston	31	11
83	49	Saint Anthony	28	9

Central Idaho

Average daily temperatures in August
High °F	Low °F	Place	High °C	Low °C
80	47	Craters of the Moon Monument	27	8
79	44	Ketchum	26	6
88	52	Lake Walcott, Minidoka Dam	31	11
85	46	Middle Fork Lodge	29	8
85	49	Salmon	29	9
85	51	St. Maries	29	11
79	32	Stanley, Sawtooth Recreation Area	26	0
86	53	Twin Falls	30	12

Southwestern Idaho

August temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
91	61	Boise	33	16
94	63	Brownlee Reservoir Dam	35	17
94	58	Bruneau	35	15
86	44	Idaho City	30	6
89	57	Lake Lowell, Deer Flat Dam	32	14
81	43	McCall	27	6
93	58	Mountain Home	34	14

Northern Idaho

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
85	52	Bonners Ferry	29	11
83	56	Coeur d’Alene	28	13
83	39	Elk City	28	4
84	49	Kellogg	29	9
90	60	Lewiston	32	16
86	45	Moscow	30	7
81	48	Mullan	27	9
86	50	Porthill	30	10
82	44	Powell	28	6
90	52	Riggins	32	11
82	50	Sandpoint	28	10
81	50	Wallace	27	10

Average Temperatures for Idaho in August

Eastern Idaho

Central Idaho

Southwestern Idaho

Northern Idaho

Reference

More Idaho Weather Information