What to Wear in Seattle in Summer: Month-by-Month Outfit Guide
Seattle in summer sits in the 60 to 75°F range. This is the layer-by-layer outfit guide for Seattle's summer weather — what to wear, what to pack for a visit, and the local context that shapes the recommendations.
WHAT TO EXPECT
60 to 75°F is the typical range for Seattle in summer (June, July, August). July through September. The reward season. 70-85°F, low humidity, often dry. Light fabrics, sunglasses, sun protection (Pacific Northwest sun can be intense after months of overcast). The temperature range is the headline; what you actually feel depends on humidity, wind, and what indoor spaces you'll cycle through.
THE FOUNDATION LAYER
A standard cotton or synthetic shirt is fine. The base layer is conversation-piece territory — not survival.
THE MID LAYER
Optional. A light cardigan or unstructured blazer handles cool mornings and air-conditioned interiors.
THE OUTERWEAR
Trench coat, light wool blazer, denim jacket, or a packable shell. Layer the outerwear, don't replace it.
ACCESSORIES
A scarf for cool mornings, a packable umbrella, and shoes you can walk in for an hour.
WHAT TO PACK FOR A TRIP TO SEATTLE IN SUMMER
Three layer permutations covering the 60 to 75°F range, plus accessories. If your trip spans the season's edge (early March or late November), pack toward the cooler end of the range — overestimating warmth is easier to recover from than underestimating.
LOCAL CONTEXT
Locals do not use umbrellas — they use hoods. A water-resistant breathable jacket is the most useful single garment in Seattle. Light rain (Seattle's typical) demands a different jacket than heavy rain (a Gore-Tex shell with sealed seams).