Portland weather
Our guide to the weather in Portland during August
We've looked at the most up-to-date weather data for Portland, covering the last 12 years up to 2026, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Portland weather in August.
How warm is it in Portland during August?
August is typically the hottest month in Portland. The temperature hits about 29℃ during the day, falling away to a balmy 14℃ at night.The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in Portland during August?
On average, in August you'll see rain on just one day in the month. In other words, you shouldn't see any of the wet stuff. You're not likely to see a thunderstorm during your trip.
Is it windy in Portland during August?
No - there is very light air movement in August so conditions should be calm with light breezes at times.
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