Average May Temperatures for Oregon

Average temperatures for May 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 May temperatures
High °F	Low °F	Place	High °C	Low °C
61	46	Astoria	16	8
62	48	Brookings	17	9
62	47	Gold Beach	17	8
60	45	Honeyman State Park	16	7
58	46	Newport	15	8
61	48	North Bend	16	9
61	48	Port Orford	16	9
60	46	Seaside	15	8
61	44	Tillamook	16	7

Willamette Valley

Average daily temperatures in May
High °F	Low °F	Place	High °C	Low °C
68	45	Corvallis	20	7
68	44	Eugene	20	7
69	47	Lebanon	21	9
69	48	Portland	21	9
69	46	Salem	21	8

Cascade Mountains

May temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
49	29	Crater Lake Park	9	-2
65	46	Detroit Lake Dam	18	8
54	36	Government Camp	12	2
74	46	Grants Pass	23	8
60	36	Howard Prairie Lake Dam	16	2
67	36	Klamath Falls	20	2
65	38	Lakeview	18	3
71	43	McKenzie Bridge	21	6
74	47	Medford	23	8
73	47	Roseburg	23	8
64	44	Three Lynx	18	7
70	43	Toketee Falls	21	6
63	36	Wickiup Reservoir Dam	17	2

Central Oregon

Average May temperatures
High °F	Low °F	Place	High °C	Low °C
66	37	Bend	19	3
68	46	Hood River	20	8
68	36	Madras	20	2
73	47	The Dalles	23	8

Eastern Oregon

Average May temperatures
High °F	Low °F	Place	High °C	Low °C
62	35	Hart Mountain Antelope Refuge	17	2
69	45	Heppner	21	7
68	43	La Grande	20	6
75	42	Lake Owyhee Dam	24	6
68	39	Malheur National Wildlife Refuge	20	4
74	47	Ontario	23	8
73	45	Pendleton	23	7
62	32	Seneca	17	0
70	37	Summer Lake	21	3

Average Temperatures for Oregon in May

Oregon Coast

Willamette Valley

Cascade Mountains

Central Oregon

Eastern Oregon

Reference

More Oregon Weather Information