Portland, Oregon weather in August
Temperature, rain and sunshine in August: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in August
Excellent
Best time to visit: June – September
What is the weather like in Portland, Oregon in August?
In August, Portland, Oregon is hot: daytime highs average 28 °C, and nights cool down to about 15 °C. With around 10 hours of sunshine a day, there is plenty of sun. Rain is rare: about 3 days bring 14 mm in total. On about 10 days the thermometer climbs to 30 °C or more. All in all, August is an excellent month for a holiday in Portland, Oregon.
August compared
How the weather changes from July to September. Tap a month to open it.
| JulyJul | AugustAug | SeptemberSep | |
|---|---|---|---|
| Score | 99 | 96 | 91 |
| Day | 27° | 28° | 24° |
| Night | 14° | 15° | 12° |
| Sun | 11 h | 10 h | 8 h |
| Rain days | 2 | 3 | 6 |
More details for August
- Daylight
- 14 h 11 min06:10 – 20:21
- UV index
- 7 · highclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 12 km/haverage daily peakAll months
- Cloud cover
- 36 %on averageAll months
- Hot days
- 10 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC−7America/Los_Angeles
How the score comes together
- Temperatureweight 50 %92 %
- Sunshineweight 20 %100 %
- Few rainy daysweight 30 %100 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in August
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- A jumper for the evenings
Portland, Oregon in August: quick answers
Is Portland, Oregon hot in August?
Yes. In August, Portland, Oregon is hot: daytime highs average 28 °C and nights stay around 15 °C. On about 10 days the thermometer climbs to 30 °C or more.
Does it rain much in Portland, Oregon in August?
Rain is rare: about 3 days bring 14 mm in total.
Portland, Oregon month by month
The whole year in Portland, OregonAll destinations: USAWhere to go in August
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences