Average Precipitation for Oregon in September

The tables below give monthly averages for rainfall plus snowfall during September 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 September
Days	Place	Inches	Millimetres
10	Astoria	2.7	68
5	Brookings	1.8	45
5	Gold Beach	1.4	36
7	Newport	2.3	59
6	North Bend	1.6	39
6	Port Orford	1.5	39
9	Seaside	2.9	74
10	Tillamook	3.6	91

Willamette Valley

September averages for total rainfall plus snowfall
Days	Place	Inches	Millimetres
7	Corvallis	1.5	38
6	Eugene	1.4	35
7	Portland	1.7	42
6	Salem	1.5	37

Cascade Mountains

Average amount of rain and snow in September
Days	Place	Inches	Millimetres
5	Crater Lake Park	1.9	49
7	Detroit Lake Dam	2.8	71
7	Government Camp	3.1	78
3	Grants Pass	0.6	14
4	Howard Prairie Lake Dam	0.7	17
3	Klamath Falls	0.3	8
3	Lakeview	0.6	16
3	Medford	0.5	12
4	Roseburg	0.9	22
7	Three Lynx	2.1	54
5	Toketee Falls	1.5	38
4	Wickiup Reservoir Dam	0.6	15

Central Oregon

Precipitation totals for September
Days	Place	Inches	Millimetres
2	Bend	0.3	8
4	Hood River	0.7	18
3	Madras	0.4	9
2	The Dalles	0.3	8

Eastern Oregon

Total precipitation during September
Days	Place	Inches	Millimetres
4	Heppner	0.4	11
4	La Grande	0.7	17
3	Lake Owyhee Dam	0.4	10
2	Ontario	0.3	9
4	Pendleton	0.5	13
4	Seneca	0.5	13
4	Summer Lake	0.6	15