Month-by-month travel weather
Seattle August weather
Seattle, United States · August
Waterfront breezes can feel chilly later
August stays in the dry-season pattern, with many warm, bright days that suit outdoor plans.
After sunset, breezes near the water can feel cool—an evening layer keeps comfort steady.
August averages at a glance
Average low
around 13–15°C
Average high
around 24–27°C
Average precipitation
around 20–40 mm
Rainy days
about 3–6 days
What to wear in August in Seattle
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • T-shirts by day + thin layer for evenings.
- • Sun protection can help.
- • Bring an extra thin layer if you plan mountain day trips.
Travel tips for visiting Seattle in August
- • Waterfront areas can cool quickly when wind picks up.
- • Indoors can run cool A/C—thin layers help.
August weather in Seattle — FAQ
Q. Are August nights cool?
A. Often yes, especially near the water.
Q. Is it humid?
A. Usually not very humid; comfort depends more on sun and breeze.
Explore Seattle
These pages are connected so you can compare conditions and decide for yourself.