Portland in August
So, what's Portland actually like in August? In a word: mild. It's winter, and the days are averaging 16.2 degrees.
The average daily maximum is 16.2 degrees with overnight lows of 9.4 degrees. It's cool but manageable. A jumper handles most of it.
At 16.2 degrees, August sits 1.7 degrees below the annual average of 17.9 degrees.
You're looking at 70mm of rain across 13 days in a typical August. A decent amount, but not relentless.
Solar exposure averages 10.2 MJ/m2 per day in August, with UV levels in the moderate range. Sunscreen is still wise, especially if you burn easily.
With a Comfort Score of 3.4/10, August is not the most comfortable time to visit.
Packing tip: bring layers you can peel on and off, and a rain jacket or compact umbrella.
Check the data table below for the full picture, or compare Portland in August with another destination.
August at a Glance
Temperature Range
Daily temperature range in August. The bar shows the typical spread between overnight lows and afternoon highs.
What to Pack
- Layered clothing for mild to cool conditions
- A warm jumper or fleece for cool mornings and evenings
- A waterproof jacket or compact umbrella
Coming From Overseas?
How August in Portland stacks up against major cities around the world.
About 8 degrees cooler and considerably wetter.
About 14 degrees cooler and considerably drier.
About 15 degrees cooler and considerably drier.
How August Compares
Portland's monthly climate at a glance. August is highlighted.
| Month | Max | Min | Rain | Comfort |
|---|---|---|---|---|
| Jan | 21.2 | 14.6 | 71mm | 8.2 |
| Feb | 22.2 | 13.5 | 5mm | 10.0 |
| Mar | 21.9 | 13.7 | 14mm | 9.2 |
| Apr | 16.9 | 11.3 | 54mm | 4.0 |
| May | 15.9 | 9.7 | 23mm | 3.5 |
| Jun | 13.2 | 7.6 | 37mm | 1.5 |
| Jul | 13.0 | 7.4 | 84mm | 1.0 |
| Aug | 16.2 | 9.4 | 70mm | 3.4 |
| Sep | 14.8 | 10.0 | 90mm | 2.3 |
| Oct | 17.7 | 10.4 | 68mm | 5.6 |
| Nov | 19.8 | 12.0 | 91mm | 7.1 |
| Dec | 21.5 | 13.2 | 41mm | 9.1 |