What to Wear in Seattle in August
Seattle in August: 25°C / 77°F afternoons, 14°C / 57°F mornings, 5 rain days, 281 sunshine hours — secret best month alongside July.
- A rust brown cutout midi dress and Birkenstocks — peak summer, deliberate brights against PNW gray
- Tank + light blue striped button-down combos for ferry decks and AC restaurants
- Black floral print shorts for Ballard-Fremont walking days
- A swimsuit + cover-up for Bainbridge, Vashon, or San Juans ferry trips
- A cream crewneck sweatshirt for 15-17°C / 59-63°F ferry decks even on 25°C / 77°F days
- N95 masks in the bag — BC or California fire smoke can spike AQI
- SPF 30 and an AirNow.gov check every morning
- Ignore fire smoke risk — pack N95s and check AirNow.gov daily
- Wear stilettos on Seattle hills — still impractical in August
- Skip the cardigan for Kerry Park sunset photos — golden hour is cool
August is Seattle's best-kept travel secret alongside July. NOAA climate data show afternoons at 25°C (77°F), mornings at 14°C / 57°F, just 5 rain days and 25mm rainfall, and 281 hours of sunshine — only slightly less than July. The Mediterranean-feel dry summer continues through August; fire smoke from BC or California can occasionally push AQI into unhealthy ranges on unlucky days, but most Augusts are uneventful. Seafair hydroplane races, Bumbershoot (late August-early September), and Pacific Northwest ferry day trips to Bainbridge, Vashon, or the San Juans dominate local plans. The Seattle August uniform finally lets go of the rain shell as daily gear (pack one for emergencies but don't wear it daily); leans into Birkenstocks, a rust brown cutout midi, black floral shorts, linen trousers, clean sneakers. Mornings still start at 14°C / 57°F with Puget Sound breeze — cream crewneck sweatshirt in the bag daily. Tech culture continues to keep dress codes smart-casual most places.
The Mediterranean-feel dry summer continues through August — fire smoke from BC or California can occasionally push AQI into unhealthy ranges on unlucky days.
The capsule
01Rust brown cutout midi dressThe warm color gives Seattle's summer-grey backdrop deliberate contrast and carries directly into a Capitol Hill dinner.
02Cream cotton sundressThe lighter daytime rotation for Alki, Bainbridge, or a warm 25°C / 77°F neighborhood afternoon.
03Light blue striped button-downWear it open over the tank on ferry decks, at Kerry Park sunset, and in over-cooled restaurants.
04White ribbed tankThe warm-afternoon base layer, clean enough for the Market and compact enough for a ferry-day bag.
05Black floral print shortsMore intentional than athletic shorts and dark enough to handle a full market-and-ferry day.
06Cream wide-leg linen trousersThe Capitol Hill dinner alternative keeps airflow while covering the evening temperature drop.
07Cream crewneck sweatshirtPuget Sound breeze cools evenings to 14°C / 57°F, and this rolls into the bag without bulk.
08Light-wash denim jacketThe structured evening layer shown in the illustrated dinner look; enough warmth without carrying rain gear.
09Tan leather footbed slidesThe easy summer shoe for the Market and ferry, with more support than a flip-flop.
10White low-top sneakersUse these for Discovery Park, Volunteer Park, and any day with sustained walking.
11Woven straw basket bagThe rounded basket holds a ferry picnic and a cover-up and reads lighter than a commuter bag in August.
12Black scoop-neck one-piece swimsuitAlki Beach, Lake Washington, kayaking, and Green Lake all peak in August.
13White linen cover-up shirtLoose enough for the beach and useful as a second ferry layer when the breeze picks up.
14Tortoiseshell sunglassesSeattle August UV is higher than visitors expect, especially on the water.
15Forest green baseball capA low-key PNW sun layer for the market, ferry deck, and park.
16SPF 50Water reflection and long dry days make reapplication essential even when the air feels cool.
17N95 respiratorKeep one in the bag for the occasional BC, eastern Washington, or California smoke day.
18Brown structured small bagThe compact dinner bag in the illustrated evening look, polished without fighting Seattle's smart-casual register.
Day to night
Tank · black floral print shorts · Birkenstocks · woven straw basket bag · cap. Farmers Market at U District, ferry to Bainbridge Island.
Rust brown cutout midi dress · denim jacket · clean sneakers · structured small bag. Dinner at Canon (Capitol Hill) or Rupee Bar (Ballard).
What to avoid
- Heavy rain gear — August rarely needs it (5 rain days, drizzle not downpour)
- Assuming California summer heat — Seattle August averages 25°C / 77°F
- Ignoring fire smoke risk — check AirNow.gov daily and pack N95s
- Stilettos — Seattle hills haven't softened for August
- Leaving the cardigan at the hotel — Puget Sound evenings remain cool
- Big athletic shoes outside Discovery Park — tech-casual isn't gym-wear
Frequently asked questions
Per NOAA climate data: average daily high is 25°C (77°F), low is 14°C (57°F). Only 5 rain days with 25mm rainfall. 281 hours of sunshine. One of the driest, sunniest months — similar to July but slightly shorter daylight and occasional BC/California fire smoke risk.
Among the best months. Dry, mild, sunny, long evenings. Seafair (hydroplane races + Blue Angels), Bumbershoot festival late-August, peak ferry day-trip season (Bainbridge, Vashon, San Juans). Trade-offs: peak tourism, higher hotel prices, occasional fire smoke days.
Occasionally. Fires in British Columbia, eastern Washington, or Northern California can push smoke west-to-east, dropping AQI to unhealthy ranges for 3-7 days at a time. Check AirNow.gov daily. Pack 2-3 N95 masks for backup. On smoke days, indoor alternatives (Chihuly Garden, Museum of Pop Culture, Pike Place indoor areas) work.
Not as daily gear. 5 rain days per month and 25mm rainfall total — less than Paris, London, or Lisbon. If staying 3-4 days, you can reasonably skip it and rely on a cardigan. If staying longer, pack a compact rain shell for 1-2 rainy afternoons.
Layers that handle cool Puget Sound breeze (15-17°C / 59-63°F on ferry deck even in 25°C / 77°F sun). Black floral print shorts or linen trousers, tank + light blue striped button-down, denim jacket, Birkenstocks or clean sneakers, woven straw basket bag with picnic + water. Cream crewneck sweatshirt in the bag for the ride home (golden hour on the ferry is cool). Skip heels — ferry decks are metal and slippery.
Sources
- NOAA — 1991–2020 climate normals, Seattle-Tacoma International Airport (SEA) station
