Portland
August
Weather in Portland for August 2025
Your guide to Portland weather in August - trends and predictions
In general, the average temperature in Portland at the beginning of August is 31.4 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 28 °F by the end of August.
With an average of 4 rainy days, Portland experiences minimal rainfall in August, ensuring that most days remain pleasantly dry.
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27
Dry days
4
Rainy days
0
Snow days
31°/15°
Temperatures
14 km/h
Avg max wind
54 %
Avg humidity
Portland in August average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  34° | 2  34° | 3  30° | ||||
| 4  32° | 5  31° | 6  29° | 7 30° | 8 30° | 9 29° | 10 30° |
| 11 29° | 12 28° | 13 32° | 14 34° | 15 33° | 16 32° | 17 32° |
| 18 26° | 19 28° | 20 29° | 21 25° | 22 23° | 23 21° | 24 24° |
| 25 29° | 26 32° | 27 27° | 28 27° | 29 27° | 30 28° | 31 26° |
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Temperatures trend during August in Portland
See the weather trend as well as the moving average line
August weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Aug. 1 | Overcast | 34° /14° | 0 mm | 8 | |
| Aug. 2 | Sunny | 34° /17° | 0 mm | 8 | |
| Aug. 3 | Partly cloudy | 30° /16° | 0 mm | 8 | |
| Aug. 4 | Cloudy | 32° /15° | 0 mm | 8 | |
| Aug. 5 | Patchy rain possible | 31° /16° | 0.1 mm | 8 | |
| Aug. 6 | Moderate rain at times | 29° /16° | 0.2 mm | 7 | |
| Aug. 7 | Overcast | 30° /15° | 0 mm | 7 | |
| Aug. 8 | Overcast | 30° /15° | 0 mm | 7 | |
| Aug. 9 | Patchy rain possible | 29° /17° | 0.2 mm | 7 | |
| Aug. 10 | Overcast | 30° /15° | 0 mm | 7 | |
| Aug. 11 | Partly cloudy | 29° /14° | 0 mm | 7 | |
| 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 | |
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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.
Portland in August - FAQ
What are the expected maximum and minimum temperatures in Portland during August?
Expect warm days with temperatures around 31°, cooling to mild conditions of 15° after sunset. Perfect for those who enjoy warm weather.
How much rainfall should be expected in Portland during August?
Rainfall in Portland during August is rare to nonexistent, with the total expected rainfall being less than 10 mm and approximately 4 days seeing any precipitation. Planning without the concern for rain is generally straightforward during this very dry period.
What are the typical wind conditions in Portland during August?
The average wind speed in Portland during August is 14 km/h, suggesting breezy to windy conditions, depending on your activities.
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