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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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Average dry days
27
Dry days
Average rainy days
4
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/15°
Temperatures
Average wind speed
14 km/h
Avg max wind
Average humidity
54 %
Avg humidity

Portland in August average weather

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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
Overcast
34° /14° 0 mm 8
Aug. 2 Sunny
Sunny
34° /17° 0 mm 8
Aug. 3 Partly cloudy
Partly cloudy
30° /16° 0 mm 8
Aug. 4 Cloudy
Cloudy
32° /15° 0 mm 8
Aug. 5 Patchy rain possible
Patchy rain possible
31° /16° 0.1 mm 8
Aug. 6 Moderate rain at times
Moderate rain at times
29° /16° 0.2 mm 7
Aug. 7 Overcast
Overcast
30° /15° 0 mm 7
Aug. 8 Overcast
Overcast
30° /15° 0 mm 7
Aug. 9 Patchy rain possible
Patchy rain possible
29° /17° 0.2 mm 7
Aug. 10 Overcast
Overcast
30° /15° 0 mm 7
Aug. 11 Partly cloudy
Partly cloudy
29° /14° 0 mm 7
Aug. 12 Overcast
Overcast
28° /14° 0 mm 7
Aug. 13 Sunny
Sunny
32° /14° 0 mm 8
Aug. 14 Sunny
Sunny
34° /16° 0 mm 9
Aug. 15 Sunny
Sunny
33° /17° 0 mm 8
Aug. 16 Sunny
Sunny
32° /17° 0 mm 8
Aug. 17 Overcast
Overcast
32° /16° 1.7 mm 7
Aug. 18 Overcast
Overcast
26° /14° 0.1 mm 6
Aug. 19 Sunny
Sunny
28° /11° 0 mm 8
Aug. 20 Partly cloudy
Partly cloudy
29° /13° 0.2 mm 7
Aug. 21 Overcast
Overcast
25° /13° 0 mm 6
Aug. 22 Overcast
Overcast
23° /13° 2.5 mm 5
Aug. 23 Overcast
Overcast
21° /12° 5.7 mm 5
Aug. 24 Sunny
Sunny
24° /11° 0.8 mm 6
Aug. 25 Patchy rain possible
Patchy rain possible
29° /14° 0.8 mm 7
Aug. 26 Sunny
Sunny
32° /15° 0 mm 8
Aug. 27 Sunny
Sunny
27° /15° 0.1 mm 7
Aug. 28 Overcast
Overcast
27° /13° 0 mm 6
Aug. 29 Overcast
Overcast
27° /13° 0 mm 7
Aug. 30 Overcast
Overcast
28° /15° 0 mm 7
Aug. 31 Light rain shower
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.

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 ☀️

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Location coordinates 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.

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