Month-by-month travel weather
Portland August weather
Portland, United States · August
Air quality can matter more than temperature on some days
August stays dry and can run hot at midday, especially during warm spells.
Some years bring smoke/air-quality issues that change outdoor comfort—plans may need flexibility.
August averages at a glance
Average low
around 13–16°C
Average high
around 27–31°C
Average precipitation
around 15–35 mm
Rainy days
about 3–6 days
What to wear in August in Portland
Actual feel will change with wind and rain, but use the suggestions below to build a comfortable layered outfit.
- • Breathable clothing + sun protection helps.
- • Optional thin evening layer.
- • On smoky days, consider more indoor time.
Travel tips for visiting Portland in August
- • Shift longer walks to morning/evening on hotter days.
- • If air quality is poor, keep viewpoints and hikes flexible.
August weather in Portland — FAQ
Q. Is smoke common in August?
A. It varies by year. When it happens, it can affect outdoor plans.
Q. Are nights cool?
A. They can cool down, though warm nights are also possible.
Explore Portland
These pages are connected so you can compare conditions and decide for yourself.