Average Precipitation for Oregon in May





The tables below give monthly averages for rainfall plus snowfall during May at cities, towns and lakes in Oregon.

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 precipitation 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: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

Oregon Coast

Average monthly precipitation in May
Days Place Inches Milli­metres
16 Astoria 3.4 86
11 Brookings 3.9 99
11 Gold Beach 3.5 88
13 Newport 3.0 75
12 North Bend 3.0 75
11 Port Orford 3.4 86
14 Seaside 3.9 98
15 Tillamook 4.6 116

Willamette Valley

May averages for total rainfall plus snowfall
Days Place Inches Milli­metres
13 Corvallis 2.3 59
12 Eugene 2.5 62
14 Portland 2.8 70
12 Salem 2.3 57

Cascade Mountains

Average amount of rain and snow in May
Days Place Inches Milli­metres
12 Crater Lake Park 3.7 93
16 Detroit Lake Dam 6.0 153
14 Government Camp 5.8 146
9 Grants Pass 1.4 35
11 Howard Prairie Lake Dam 2.0 52
8 Klamath Falls 1.0 26
9 Lakeview 1.4 35
9 Medford 1.3 34
10 Roseburg 2.1 52
16 Three Lynx 4.4 112
13 Toketee Falls 3.3 83
9 Wickiup Reservoir Dam 1.3 34

Central Oregon

Precipitation totals for May
Days Place Inches Milli­metres
5 Bend 1.0 25
9 Hood River 1.3 34
8 Madras 1.1 28
6 The Dalles 0.8 19

Eastern Oregon

Total precipitation during May
Days Place Inches Milli­metres
10 Heppner 1.7 43
9 La Grande 2.2 57
9 Lake Owyhee Dam 1.1 29
7 Ontario 1.4 36
10 Pendleton 1.5 37
10 Seneca 1.7 43
11 Summer Lake 1.4 36
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Oregon Precipitation
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