Oregon climate
World Climates covers 4 places in Oregon. By annual mean temperature, the warmest is Portland (12 °C54 °F) and the coolest is Hillsboro (11 °C52 °F). The wettest is Hillsboro with 1,495 mm59 in of precipitation per year, the driest Salem with 1,370 mm54 in.
The most common climate types (Köppen classification computed from these averages) are warm-summer Mediterranean (Csb, 4 places).
The highest monthly average high is in Portland (29 °C84 °F in August); the lowest monthly average low is in Salem (2 °C35 °F in December).
Across the places in Oregon, the months that most often rank as the most comfortable are June, July and August (4, 4 and 4 of 4 places respectively).
Frequently asked questions
Which is the warmest place in Oregon?
By annual mean temperature, the warmest place in Oregon is Portland at 12 °C54 °F. The coolest is Hillsboro at 11 °C52 °F.
Where does it rain the most in Oregon?
Hillsboro gets the most precipitation, 1,495 mm59 in in an average year. The driest place is Salem with 1,370 mm54 in.
How many places in Oregon does this site cover?
World Climates has climate data for 4 places in Oregon. Each one has a page with monthly averages for temperature, rainfall, humidity and daylight.
When is the best time to visit Oregon?
It depends on the place. Across Oregon, the months that most often rank as the most comfortable are June, July and August. Check the page of each city for its own best months.
Climate of every place in Oregon
| Place | Year | Max high | Min low | Precip. |
|---|---|---|---|---|
| Portland | 12 | 29 | 2 | 1,484 |
| Eugene | 12 | 27 | 2 | 1,375 |
| Salem | 11 | 27 | 2 | 1,370 |
| Hillsboro | 11 | 26 | 2 | 1,495 |
Year = annual mean temperature; max high = average high of the warmest month; min low = average low of the coldest month; precip. = annual total. Temperatures in °C°F, precipitation in mminches. Sorted by population.
Other cities over 100,000 people
These cities share a NASA POWER grid cell with a larger place, so their averages are shown on that page:
Data: NASA POWER climatology 2001–2025 (MERRA-2 reanalysis, CERES satellite data) — grid-cell averages, not station records. Sources and method.