How Much Rain Each Portland Metro and Southwest Washington City Gets, and How Many Days It Falls
Everyone knows it rains here. Fewer people know that Seaside gets nearly twice what Salem gets, that the coast sees rain on more than 200 days a year, or that about half of every city's rain arrives in the four months between November and February. This page puts NOAA's official thirty year averages next to each of the 33 cities VResh serves, because rainfall is the single biggest reason exterior work in this region is different from anywhere else.
- 43 in
- Portland's average annual precipitation, on 154 days a year
- 95 in
- Lincoln City, the wettest city on the list, with 204 wet days
- 37 in
- Hillsboro, the driest, though still on 162 days a year
- 57%
- of Portland's rain falls from November through February
Table: every city, ranked by rainfall
Sort by any column. Wet days are days with at least 0.01 inch; the heavy day columns count half inch and one inch days.
| NOAA station |
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Source: NOAA National Centers for Environmental Information, U.S. Climate Normals 1991 to 2020, annual and monthly precipitation normals, retrieved September 20, 2026 through the NCEI Access Data Service. Each city uses its nearest normals station; where that station does not report day counts, wet days come from the nearest station that does, and both are named. Distances are from the city center. Download the data as CSV.
What the pattern looks like
The Willamette Valley floor is the dry core of the region: Hillsboro, Salem, Vancouver and Beaverton all land between 37 and 41 inches, on roughly 145 to 160 wet days. Rainfall climbs steadily toward the Cascade foothills, so Gresham and Wood Village pick up several more inches than downtown Portland, Estacada is near 58, and the Bull Run station above Sandy records 78. North of the Columbia the rise is faster, with Battle Ground at 53 inches and Kalama near 67.
The coast is a different climate. Seaside, Long Beach and Lincoln City all see 75 to 95 inches, arrive on more than 180 days a year, and receive far more of it on heavy days: the Otis station near Lincoln City records 27 days a year with an inch or more, against 6 in Beaverton. That volume plus onshore wind is why coastal siding, window flashing and roof edges have a shorter life and why moisture damage there is found behind siding that still looks fine from the street.
Everywhere on the list, November through February carries roughly half the annual total, and July plus August together bring under two inches at every inland station. That is the exterior construction calendar for the region: open a wall in summer, close it before the rain returns.
Serving Portland Metro Area
VResh Construction provides window replacement, siding installation, roofing, dry rot repair and full exterior renovation services throughout the Portland metro area and Southwest Washington.
Portland Metro — Oregon
Southwest Washington
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Questions about this data
Client's Talk
We have a wealth of experience working as main building contractors on all kinds of projects, big and small, from home maintenance and improvements to extensions, refurbishments and new builds.
Rain finds the weak spots. We fix the cause.
VResh Construction repairs dry rot, replaces siding and windows, and rebuilds the flashing details that keep water out, across every city on this map. We diagnose where the water is getting in before we quote the repair.