Average August Temperatures for Oregon

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

You can jump to a separate table for each region of the state: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

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.

Oregon Coast

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
69	54	Astoria	20	12
66	54	Brookings	19	12
69	53	Gold Beach	20	12
67	51	Honeyman State Park	20	11
64	52	Newport	18	11
67	54	North Bend	20	12
68	54	Port Orford	20	12
66	54	Seaside	19	12
69	50	Tillamook	21	10

Willamette Valley

Average daily temperatures in August
High °F	Low °F	Place	High °C	Low °C
84	51	Corvallis	29	11
84	52	Eugene	29	11
86	56	Lebanon	30	13
82	57	Portland	28	14
84	55	Salem	29	13

Cascade Mountains

August temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
69	42	Crater Lake Park	21	5
81	56	Detroit Lake Dam	27	13
70	48	Government Camp	21	9
91	55	Grants Pass	33	13
79	46	Howard Prairie Lake Dam	26	8
85	47	Klamath Falls	29	8
85	49	Lakeview	29	9
86	49	McKenzie Bridge	30	10
91	58	Medford	33	14
89	56	Roseburg	31	13
79	52	Three Lynx	26	11
85	51	Toketee Falls	29	10
82	46	Wickiup Reservoir Dam	28	8

Central Oregon

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
83	48	Bend	29	9
82	55	Hood River	28	13
85	44	Madras	30	7
89	57	The Dalles	31	14

Eastern Oregon

Average August temperatures
High °F	Low °F	Place	High °C	Low °C
83	46	Hart Mountain Antelope Refuge	28	8
86	55	Heppner	30	13
87	53	La Grande	31	12
93	53	Lake Owyhee Dam	34	12
83	48	Malheur National Wildlife Refuge	28	9
91	57	Ontario	33	14
90	54	Pendleton	32	12
82	35	Seneca	28	2
89	47	Summer Lake	32	8

Average Temperatures for Oregon in August

Oregon Coast

Willamette Valley

Cascade Mountains

Central Oregon

Eastern Oregon

Reference

More Oregon Weather Information