Deck Staining Weather in Beaverton, OR: 10-Day Windows & Best Months

Q: What temperature is too cold to stain a deck?

Standard stains want 50–90°F with nights holding 40°F+ through the first 24 hours. In Beaverton the night rule is the gatekeeper — December lows average 40°F, and even August nights run 57°F.

Q: How long does deck stain need to dry before rain?

Plan on 24 dry hours minimum (48 for oil formulas). The engine above fails any day with 0.05"+ inside the cure and flags the 24–48 h stretch for oil. Beaverton's daily rain odds range from 13% in August to 64% in January — the calendar does half the work.

Q: Can I stain a deck in direct sunlight?

Avoid it. A Beaverton board in full sun runs 20–30°F over the air, so a 81°F July afternoon can mean a 100°F+ surface — past the 90°F label ceiling. Stain flashes before it penetrates and shows every lap mark. Shaded side, morning into early afternoon.

Q: How dry should wood be before staining?

Two checks: a moisture meter under 15%, or water droplets soaking in within a minute. The engine enforces the weather half — a hard fail for rain in the last 24 hours, a flag out to 48. In Beaverton's drier months (August: 13% rain days) wood recovers fast; in January give it the full 48.

Q: Water-based vs oil-based stain in a wet climate?

In rain-prone stretches, the cure length decides: water-based closes its window in 24 hours, oil needs up to 48. With 64% rain-day odds in January versus 13% in August, Beaverton rewards water-based in the shoulder months and frees the choice in the dry ones.

Q: What months are best for staining in OR?

The table above puts August, July and September on top; August alone averages 27 days that clear every rule. Statewide the ranking shifts with elevation and latitude — the OR state page compares every listed city month by month.

In Beaverton, the label math works from February through November: that's the stretch with 8+ workable days a month against typical deck staining rules. August leads the calendar with 27 workable days: average high 82°F, low 57°F, rain on 13% of days. The strip above runs Beaverton's live forecast; the table below ranks all 12 months.

GOOD — clears every rule MARGINAL — exactly one soft miss NO — a hard fail, or two soft

The rules this check uses

The strip above scores Beaverton's forecast against exactly these rows — typical numbers across stain manufacturers, oil formulas simply stretching the dry-after hours.

Typical label thresholds for deck staining — the ruleset behind every Beaverton verdict above.
Check	Threshold	Why it matters
Air temperature	50–90°F	Checked across the working day, 8 a.m.–6 p.m., against Beaverton's hourly forecast — not just the daily high.
Overnight low	≥40°F during the first 24 h	The engine reads every overnight hour in the cure window, not just Beaverton's forecast low.
Dry before	≤0.05" rain in the prior 24 h; watch back to 48 h	Wood must dry out after rain before it can absorb stain.
Dry after	<0.05" rain for 24 h after (48 h oil-based formulas want 48 h dry)	Water-based stains need roughly 24 dry hours; oil-based closer to 48.
Evening dew-point spread	≥5°F from 6–11 pm	Scored on the worst hour between 6 and 11 p.m., when surfaces cool past the air.
Daytime humidity	≤85%	Daytime relative humidity slows dry time.
Wind	≤15 mph (brush or pad only up to 20 mph)	Wind wrecks application first (drift, lap marks) and carries debris into wet work second.

Always follow your product label — formulas vary. These rows are the industry-typical range; the can in your Beaverton garage is the contract.

Best months for deck staining in Beaverton

Workable days in Beaverton, OR: days meeting the temperature rules, discounted by NOAA rain odds — a 1991–2020 estimate, not a forecast.
Month	Avg high	Avg low	Rain odds/day	Workable days
January	50°F	40°F	64%	5
February	54°F	40°F	62%	11
March	58°F	42°F	63%	12
April	63°F	45°F	56%	13
May	70°F	50°F	44%	17
June	73°F	53°F	33%	20
July	81°F	56°F	14%	27
August	82°F	57°F	13%	27
September	76°F	52°F	32%	21
October	65°F	47°F	53%	14
November	55°F	43°F	63%	11
December	49°F	40°F	61%	1

The working season runs February through November — about 179 workable days a year. The edges are night-limited: label rules want overnight lows of 40°F+, and Beaverton's nights only average that from January to November. For the statewide picture, the Oregon page compares peak months city by city.

Beaverton has a real wet/dry rhythm: January brings rain on 64% of days versus 13% in August. When the calendar gives you a August-side window, the dry-before and dry-after rules nearly take care of themselves.

The physics transfers: exterior painting in Beaverton runs the same 50–90°F band and dew clock, differing mainly in prep.

Numbers above come from NOAA's 1991–2020 normals for Nature Park-Beaverton, Or Us, 2.9 km from the city center — close enough that neighborhood microclimates (shade lines, river valleys, urban heat) matter more than station distance. See how these day counts are scored.

Beaverton by the numbers

August is Beaverton's heat peak: 82°F typical high, 0 days over 90°F.
Coldest month: December — 49°F highs over 40°F nights.
Wet-to-dry spread: 64% rain days in January versus 13% in August.
Overnight lows clear 40°F from January to November in a normal year.
Add it up and Beaverton banks 179 workable days a year for deck staining.

Prep checklist

Start with the calendar math: a 24-hour dry cure in Beaverton is a August-easy, January-hard ask (13% vs 64% rain-day odds). Lock the window before the prep.
Clean first (a pressure washer strips gray fibers fast), then let the boards dry 48 hours — August's 82°F afternoons do it quickest.
Prove the boards are dry: a wood moisture meter under 15%, or a water sprinkle that soaks in within a minute.
Knock down splinters, set proud nails, and clear the gaps between boards — drips pool there.
Tape the siding line and lay cloth drops — painter's tape where deck meets wall.
Start after morning dew burns off and work the shade: a board in August sun runs 20–30°F over Beaverton's 82°F air.
Apply thin with stain pads + applicator or a pump sprayer (spray only under 15 mph) and back-wipe puddles.
Quit about 2 hours before sunset — Beaverton's August nights average 57°F, and the dew-point spread closes fastest right after dark.

Gear that saves a window

FTC note: the gear below is unlinked until the affiliate program is switched on. See the affiliate disclosure.

Pump sprayer
Cuts application time in half on railings and spindles.
Stain pads + applicator
Faster than a brush on flat boards, no lap marks.
Pressure washer
Prep tool: strips gray fibers so stain can bite.
Wood moisture meter
Confirms boards are under 15% before you open the can.
Semi-transparent deck stain
Shows grain, hides less — the default choice for most decks.
Painter's tape
Clean lines where deck meets siding and trim.

FAQ

What temperature is too cold to stain a deck?

Standard stains want 50–90°F with nights holding 40°F+ through the first 24 hours. In Beaverton the night rule is the gatekeeper — December lows average 40°F, and even August nights run 57°F.

How long does deck stain need to dry before rain?

Plan on 24 dry hours minimum (48 for oil formulas). The engine above fails any day with 0.05"+ inside the cure and flags the 24–48 h stretch for oil. Beaverton's daily rain odds range from 13% in August to 64% in January — the calendar does half the work.

Can I stain a deck in direct sunlight?