Portland in August
August is right in the heart of winter for Portland, and the weather has a definite personality this time of year.
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.
August is 1.7 degrees cooler than Portland's yearly average.
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.
August scores 3.4/10 on our Comfort Score. It's the tough end of the year weather-wise.
Packing tip: bring layers you can peel on and off, and waterproof gear.
Scroll down for the detailed climate data, or explore what nearby cities are like in August.
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
- A jumper or light cardigan for flexibility
- 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 |