Seattle in June: 22°C afternoons, 12°C mornings, 9 rain days, 268 sunshine hours — 'June Gloom' lingers early, back half turns sunny.
June is when Seattle genuinely becomes pleasant. NOAA climate data show afternoons at 22°C, mornings at 12°C, 9 rain days, and 268 sunshine hours. 'June Gloom' lingers into the first half of the month (persistent low clouds in the mornings that burn off by afternoon), but the back half gets reliably sunny. Daylight is 16 hours. This is the month outdoor activity peaks: Kerry Park sunsets, Alki Beach walks, Fremont Solstice Parade, kayaking Lake Union. The Seattle June uniform shifts slightly warmer than May: lighter layers, more short-sleeve tees, Birkenstocks as daily footwear, but still a quarter-zip or cardigan in the bag for morning cool and evening breeze off Puget Sound. Rain gear still matters but matters less — 9 rain days versus May's 11.
'June Gloom' lingers into the first half of the month — persistent low clouds in the mornings that burn off by afternoon.

9 rain days means rain is still likely on any given day. Packable Patagonia or Arc'teryx. Rolled into backpack.

Tee alone for 22°C afternoons; linen shirt open over it for Ballard Brewing walks and Lake Union breeze.

The morning and evening layer. Everlane cashmere for polished; Patagonia Better Sweater for tech-casual.

Jeans for primary days. Tailored cotton or linen shorts for the 25°C+ days that June occasionally delivers.

For rare warm afternoons and Capitol Hill dinners. Layer with a denim jacket or cardigan.

Birkenstocks are the Seattle summer footwear — Arizona, Boston, Madrid all read local. Clean sneakers for rainy days.

Tech culture makes backpacks acceptable; outdoor culture makes Hydro Flask/Yeti water bottles standard. A commuter backpack is correct.
Short-sleeve tee · jeans · fleece · rain shell in bag · Birkenstocks. Pike Place, coffee at Storyville, Kerry Park photo.
Midi dress · denim jacket · Sambas · small crossbody. Dinner in Capitol Hill, drinks at Canon.
Per NOAA climate data: average daily high is 22°C (72°F), low is 12°C (54°F), 9 rain days, 268 sunshine hours (the most of any month through June). 'June Gloom' persists into the first half of the month (low overcast mornings burning off by noon); the back half of June is typically sunny and pleasant.
June is in the top 3 — sunny, mild, and long daylight (16 hours). July and August are drier but June has more daylight and is less crowded. Book early if visiting late June (peak tourism starts); early June is cheaper and still mostly pleasant.
Layered casual, outdoor-adjacent. Typical daily uniform: short-sleeve tee or long-sleeve, quarter-zip or cardigan, dark jeans or wide-leg trousers, clean sneakers or Birkenstocks, packable rain shell, backpack or commuter bag. Birkenstocks are a PNW summer staple — Arizona, Boston, Madrid styles all local.
Yes, on the warmer days (22°C+). Tailored cotton or linen shorts read right; athletic shorts don't unless you're actually hiking. Seattle June has enough sunny afternoons to justify shorts, but pack jeans as primary.
Yes — 9 rain days, 37mm rainfall. Less than May's 11 days but still frequent enough that a rain shell lives in your bag. The rain is typically light drizzle, not heavy storms. 268 sunshine hours balance it out.