Portland Weather in August

In Portland, August brings high daytime temperatures around 25°C (77°F), with nights cooling to 15°C (59°F). Expect quite a bit of rainfall this month.

Rainfall in Portland in August

Historically, the month has about 10 days of rain, averaging 108 mm (4.3 in) in total. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.

Temperature in Portland in August

Daytime highs in Portland in August reach 25°C (77°F), with nights around 15°C (59°F). August is in the summer season. Overall, the month follows a fairly predictable daily temperature pattern. With lows of 15°C (59°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Portland in August

There are approximately 267 hours of sunshine this month, resulting in mostly clear days.

Average water temperature in August

With water at 18°C (64°F), swimming is comfortable for most people. It feels refreshing rather than cold, though it depends a bit on personal preference.

If you're inclined towards comfortable temperatures and drier conditions, August is a good time to visit Portland.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Portland's climate page.

Portland Temperature in August

Min Temperature 15°C (59°F)  

Max Temperature 25°C (77°F)  

Water Temperature 18°C (64°F)  

Chance of Rain 33%  

Precipitation 108 mm (4.3 in)  

Rainy days 10 days  

Humidity 76%  

Sunshine 267 hours  

Percentage Sunshine 62%  

What to Wear in Portland in August

Warm weather calls for comfortable, breathable clothing in August. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Expect water temperatures of around 18°C (64°F), which is definitely too cold for comfortable swimming. Your luggage space is better used for other items. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Portland in August

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

6/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Portland's climate page.

More climate data for Portland

Temperature Rainfall Sunshine Humidity Water Temp

See the full Portland climate overview or explore weather in the United States of America.