Portland (OR)
August
Weather in Portland, Oregon for August 2025
Your guide to Portland weather in August - trends and predictions
The forecast for the first days of August 2025 in Portland predicts temperatures to be around 31 °F, close to the historical average.
In general, the average temperature in Portland at the beginning of August is 28.3 °F. As the month progressed, temperatures tended to slightly decrease, reaching an average of 28 °F by the end of August.
With an average of 4 rainy days, Portland experiences minimal rainfall in August.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
27
Dry days
4
Rainy days
0
Snow days
29°/15°
Temperatures
13 km/h
Avg max wind
55 %
Avg humidity
Portland Weather August
Move between months or click on a day
Temperatures trend during August in Portland
See the weather trend as well as the moving average line
August weather in Portland day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 |  Cloudy | 30° /16° | 0 mm | 2.1 | |
| Aug. 2 |  Sunny | 30° /13° | 0 mm | 0 | |
| Aug. 3 | Sunny | 27° /13° | 0 mm | 5 | |
| Aug. 4 |  Partly cloudy | 25° /14° | 0 mm | 5 | |
| Aug. 5 |  Overcast | 30° /17° | 0 mm | 5 | |
| Aug. 6 | Partly cloudy | 28° /17° | 0 mm | 6 | |
| Aug. 7 | Overcast | 28° /17° | 0 mm | 5 | |
| Aug. 8 | Sunny | 31° /16° | 0 mm | 6 | |
| Aug. 9 | Sunny | 40° /16° | 0 mm | 7 | |
| Aug. 10 | Sunny | 38° /21° | 0 mm | 7 | |
| Aug. 11 | Sunny | 35° /17° | 0 mm | 6 | |
| Aug. 12 | Overcast | 28° /14° | 0 mm | 7 | |
| Aug. 13 | Sunny | 32° /14° | 0 mm | 8 | |
| Aug. 14 | Sunny | 34° /16° | 0 mm | 9 | |
| Aug. 15 | Sunny | 33° /17° | 0 mm | 8 | |
| Aug. 16 | Sunny | 32° /17° | 0 mm | 8 | |
| Aug. 17 | Overcast | 32° /16° | 1.7 mm | 7 | |
| Aug. 18 | Overcast | 26° /14° | 0.1 mm | 6 | |
| Aug. 19 | Sunny | 28° /11° | 0 mm | 8 | |
| Aug. 20 | Partly cloudy | 29° /13° | 0.2 mm | 7 | |
| Aug. 21 | Overcast | 25° /13° | 0 mm | 6 | |
| Aug. 22 | Overcast | 23° /13° | 2.5 mm | 5 | |
| Aug. 23 | Overcast | 21° /12° | 5.7 mm | 5 | |
| Aug. 24 | Sunny | 24° /11° | 0.8 mm | 6 | |
| Aug. 25 |  Patchy rain possible | 29° /14° | 0.8 mm | 7 | |
| Aug. 26 | Sunny | 32° /15° | 0 mm | 8 | |
| Aug. 27 | Sunny | 27° /15° | 0.1 mm | 7 | |
| Aug. 28 | Overcast | 27° /13° | 0 mm | 6 | |
| Aug. 29 | Overcast | 27° /13° | 0 mm | 7 | |
| Aug. 30 | Overcast | 28° /15° | 0 mm | 7 | |
| Aug. 31 | Light rain shower | 26° /15° | 1.6 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for Portland in August is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Portland forecast closer to your planned date for the most up-to-date weather information.
Change Month
Portland in August - FAQ
What are the expected maximum and minimum temperatures in Portland during August?
During August, expect a variety of temperatures with highs around 29° and lows near 15°, suitable for diverse activities and preferences.
How much rainfall should be expected in Portland during August?
Expect minimal rainfall in Portland during August, with a total of 13.9 mm over approximately 4 days. This minimal precipitation is unlikely to significantly impact plans.
What are the typical wind conditions in Portland during August?
The average wind speed in Portland during August is 13 km/h, suggesting breezy to windy conditions, depending on your activities.
August rainfall patterns in Portland
Explore the daily rainfall trends and prepare for Portlands August weather 💧
UV exposure in Portland during August
Stay informed about UV levels for safe outdoor activities throughout the month of August ☀️
Quick links
More Portland weather pages
You are here
Where is Portland?Get accurate weather forecasts for Portland, located at latitude 45.523 and longitude -122.676. Stay updated with localized weather information tailored for Portland.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.