Olympia's wet season
October through March brings 39.7 of Olympia's 50.6 inches of normal yearly rain.1 Before it starts, clear gutters and downspouts, point the downspouts away from the house, and replace damaged shingles.2
Free service. Call now and we'll connect you with a local restoration company. How it works
The data
Rain by month at Olympia Airport
NOAA's 1991 to 2020 normals; highlighted months are October to March.1
of Olympia's normal yearly rain lands between October and March: 39.7 of 50.6 inches, by our arithmetic on NOAA's monthly normals.1
| January | 7.8 in. |
|---|---|
| February | 5.09 in. |
| March | 5.68 in. |
| April | 3.67 in. |
| May | 2.26 in. |
| June | 1.46 in. |
| July | 0.53 in. |
| August | 0.96 in. |
| September | 2.04 in. |
| October | 5.07 in. |
| November | 8.21 in. |
| December | 7.85 in. |
Atmospheric rivers
NOAA describes atmospheric rivers as long, narrow regions of the atmosphere that move most of the water vapor outside the tropics. An average one carries about as much vapor as flows out of the mouth of the Mississippi.3
Most are weak and bring useful rain or snow. The ones with the most moisture and the strongest winds can produce extreme rainfall and floods, especially when they stall.3
Before October
- Clean debris out of gutters and downspouts.2
- Aim each downspout so it carries water away from the house.2
- Check the roof for missing, damaged and aging shingles.2
- Make sure the ground slopes away from the foundation.4
When a storm is already here
Close the main valve if a pipe is involved, make the power safe, and photograph the damage. The first-hour page has the order.
How this works
What happens when you call
It is free to call, and calling commits you to nothing.
![A man in a rain jacket on a covered porch talks on the phone while rain pours over a clogged gutter behind him.]()
1You call
Tell them what happened and where. Have the address ready.
- 2
We connect you
A call network puts you through to an independent local restoration company that serves Olympia and is taking calls.
![A technician points to a water stain on a sloped bedroom ceiling beside a rain-streaked dormer window while the homeowner listens.]()
3They assess and quote
If you want a visit, they look at the damage and quote their own price. Ask for it in writing.
We are a free referral service, not a contractor. The company that answers sets its own prices. How this service works
Want a local company to look at it?
Free to call. An independent restoration company that serves Olympia answers, and you decide what happens next.
Call (360) 584-9136Olympia Water Damage Advice is a free referral and information service, not a contractor. Calls go through our call-tracking line to independent local restoration companies, and we may be paid when a call qualifies. We do not do the work and do not set prices or availability. How it works
Sources
Each numbered note on this page points here. We read every page on October 24, 2026. Where sources disagree we say so; where we could not find a source we left the claim out. We are not affiliated with any of these organizations.
- NOAA NCEI, U.S. Monthly Climate Normals 1991-2020, Olympia Airport (station USW00024227), precipitation and days with 0.10 inch or more. 1991-2020 normals. www.ncei.noaa.gov/access/services/data/v1?dataset=normals-monthly-1991-2020&stations=USW00…
- Triple-I (Insurance Information Institute), How to protect your home from water damage. No date shown (page copyright 2026). www.iii.org/article/how-to-protect-your-home-from-water-damage
- NOAA, What are atmospheric rivers?. Last updated February 21, 2025. www.noaa.gov/stories/what-are-atmospheric-rivers
- U.S. EPA, A Brief Guide to Mold, Moisture and Your Home. Page updated February 18, 2026. www.epa.gov/mold/brief-guide-mold-moisture-and-your-home