Best days to stain a deck in Seattle, WA this week
Here's the next 7 days for staining a deck in Seattle, checked hour by hour against the published thresholds. Below it: what Seattle's 1991–2020 climate averages say about the months that usually work.
This week in Seattle
Asking the sky…
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov. Verdicts are guidance, not guarantees. Your product's label always wins.
When staining a deck usually works in Seattle
- On 1991–2020 averages, Seattle has normal highs of 50–90°F and normal lows of 45°F or warmer, the temperature side of the stain rules on a typical day, in May–October.
- Of those months, July averages the fewest days with 0.10" or more of rain (1.3), which matters because stain wants about 48 dry hours before and 24 rain-free hours after.
- In February–April and November, afternoons usually reach 50°F but normal lows fall below 45°F, so the first night after staining is the catch.
| Month | Avg high | Avg low | Days ≥0.10" rain | Highs 50–90°F, lows 45°F+ |
|---|---|---|---|---|
| January | 49° | 37° | 12.1 | – |
| February | 51° | 37° | 9.0 | – |
| March | 55° | 39° | 10.5 | – |
| April | 60° | 44° | 8.0 | – |
| May | 67° | 49° | 5.6 | Yes |
| June | 71° | 54° | 3.6 | Yes |
| July | 77° | 58° | 1.3 | Yes |
| August | 77° | 58° | 1.8 | Yes |
| September | 72° | 54° | 3.8 | Yes |
| October | 61° | 46° | 7.8 | Yes |
| November | 53° | 40° | 11.3 | – |
| December | 48° | 36° | 11.4 | – |
Station: Seattle Boeing Fld (NOAA NCEI USW00024234), about 9 km from central Seattle. “Rain days” count days with 0.10" or more of precipitation. “Highs 50–90°F, lows 45°F+” checks the monthly averages only; any given week can be warmer, colder or wetter.
The rules we check
- Needs 4 hours in a row of daylight.
- Air at least 50°F (45–49°F is borderline).
- No hotter than 90°F.
- Air at least 5°F above the dew point, so surfaces don't stay damp. (Fairsky default: no source gave a number)
- Humidity at or below 85%. (Fairsky default: no source gave a number)
- Wind at or under 15 mph. (Fairsky default: no source gave a number)
- Rain chance at or below 20%. (Fairsky default: no source gave a number)
- No rain in the 48 hours before, so surfaces are dry.
- No rain for 24 hours after you finish.
- The first night's low stays at 45°F or warmer.
Your product's label always wins. Labels differ by product; in the app you can enter your label's temperature range and rain-free hours, and the verdict uses them instead.
Sources: Sherwin-Williams: applying exterior stains · Sherwin-Williams: how to plan deck staining · Cabot stain technical data sheet · Thompson's WaterSeal transparent sealer
More home and yard jobs in Seattle
- Paint a house exteriorExterior latex paint: 40°F and up, 5°F above the dew point, 4 dry hours after.
- Pour concreteConcrete: 40–85°F, no rain for 24 hours, no freezing for 48.
- Spray weedsWeed killer: 3–10 mph wind, 45–85°F, 4 rain-free hours after.
- Apply pre-emergentCrabgrass pre-emergent: before soil holds 55°F (about 200 GDD), then water it in.
- Plant grass seedCool-season grass seed: soil about 50–65°F, highs 60–80°F, no washout rain.
- Seal a drivewayAsphalt sealcoat: 55°F and rising, 50°F overnight, 36 rain-free hours.
- Cover plants for frostFrost watch: cover at 34°F, or 36°F on clear, calm nights; 28°F is a hard freeze.
The app covers 47 activities in all, from mowing to a round of golf: see every activity and its rules.
Stain a deck in nearby cities
- Portland, OR145 miles away
- Spokane, WA228 miles away
- Boise, ID405 miles away
- Sacramento, CA625 miles away
- Stockton, CA669 miles away
- Ogden, UT674 miles away
All stain a deck cities: Stain a deck, by city · Home and yard in Washington
Questions
What's the best month to stain a deck in Seattle?
On 1991–2020 averages, July usually fits best in Seattle. Any given week can still be wrong for it, which is what the live verdict above is for.
How is this verdict made?
We take the National Weather Service hourly forecast for Seattle and check each hour against the thresholds listed above. The result is guidance, not a guarantee; your product's label always wins.
How long does deck stain need before rain?
Most stains ask for at least 24 rain-free hours after application, and two to three dry days before so the wood dries. Check your product's label; it wins.
Fairsky is not a substitute for official warnings. For warnings, go to weather.gov.
Live forecasts: National Weather Service / NOAA (public domain), fetched by your browser. Climate averages: NOAA NCEI U.S. Climate Normals, 1991–2020 (public domain). Activity thresholds: product data sheets, ACI and university extension guidance, linked on each page; your product’s label wins.