August · United States
Best time to visit Portland in August Weather, crowds & prices
Weather in Portland in August
Average temperature 21°C, 18 mm of rain, about 26 days with 6+ hours of sunshine and 63% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
August score
10.0/10
Ranked #1 of 12 months
- Avg temp
- 21°C
- Rainfall
- 18 mm
- Humidity
- 63%
- Days with 6h+ sun
- 26
- Crowd Density
- Peak Tourist Rush
- Average Expenses
- $$$ · Peak Season Rates ($$$)
August in Portland scores 10.0/10 for sightseeing and cultural travel - the single best month of the year. Expect around 21°C, 18 mm of rain, and roughly 26 days with 6+ hours of sunshine this month.
Portland pairs a walkable downtown of parks and bookshops with the waterfalls and wine of the Columbia gorge.
August in Portland — the year's strongest window
August averages 21°C (70°F) — pleasant for mornings and evenings on foot in the city, with a midday break when the sun is strongest.
Expect 18 mm of rain — occasional showers rather than washed-out days — alongside about 26 days with 6+ hours of sunshine and 13.9 daylight hours.
On our climate-comfort scale this is the top-ranked month of the year for Portland at 10/10 — the reference point every other month on this page is measured against.
Pack light clothing, a hat and real sun protection.
Figure on peak pricing, with this is one of the busiest months here. You are paying the year's highest rates for the year's best conditions — book early or shift a few weeks either side.
Frequently asked
- What is the weather like in Portland in August?
- In August, Portland averages 21°C, 18 mm of rain, and about 26 days with 6+ hours of sunshine. Its climate-comfort score is 10.0/10.
- Is August a good time to visit Portland?
- August earns a 10.0/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Portland in August?
- Expect about 18 mm of rain in August. Average humidity is 63% and there are about 26 days with 6+ hours of sunshine.
Curated in Portland
Tickets & experiences
Things to do in Portland
Portland, United States. Live activities and tours from GetYourGuide, matched to this destination.