Corvallis, Oregon Weather
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Climate of Corvallis: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Corvallis, with average daytime highs around 25°C. December is the coolest, when nights typically fall to about 1°C and frost is possible on the coldest nights.
The area receives about 1430 mm of rain in a typical year. Most of it falls from October to April (around 85% of the yearly total), and December is the wettest month at roughly 247 mm. The driest stretch is July to August, with under 20 mm a month.
For outdoor plans and travel, June to September usually offer the most comfortable weather in Corvallis, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 8° | 2° | 203 mm | 92% |
| Feb | 9° | 1° | 144 mm | 89% |
| Mar | 11° | 3° | 175 mm | 88% |
| Apr | 14° | 4° | 127 mm | 85% |
| May | 17° | 7° | 80 mm | 83% |
| Jun | 20° | 9° | 52 mm | 82% |
| Jul | 24° | 11° | 9 mm | 79% |
| Aug | 25° | 11° | 14 mm | 75% |
| Sep | 23° | 9° | 55 mm | 75% |
| Oct | 17° | 6° | 124 mm | 82% |
| Nov | 11° | 3° | 202 mm | 90% |
| Dec | 8° | 1° | 247 mm | 93% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Corvallis. Values describe typical conditions, not a forecast.
About Corvallis weather
Corvallis is one of many towns in Oregon's climate divide — mild, wet Pacific coast and Willamette Valley to the west, drier high desert east of the Cascades, about 59 km north of Eugene. Before the rains arrive, there's warm, dry summers (June–September) west of the Cascades. Cooler months mean mild, wet winters (November–March) in the west, colder and snowier in the east. This page shows live, auto-refreshing weather for Corvallis: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Los_Angeles.
Frequently asked questions
Corvallis is about 59 km north of Eugene, in Oregon.
Corvallis sees mild, wet winters (November–March) in the west, colder and snowier in the east.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Corvallis's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Corvallis, with average daytime highs of about 25°C and nights around 11°C.
The coldest nights come in December, when the average low is about 1°C and daytime highs reach around 8°C. Frost is possible on clear, calm nights.
Corvallis receives about 1430 mm of rain in a typical year. December is the wettest month at roughly 247 mm, and the main rainy period is October to April.
June to September usually offer the most comfortable weather in Corvallis, with mild daytime temperatures and little rain.
In November Corvallis typically sees daytime highs near 11°C and lows near 3°C, with about 202 mm of rain over the month and average humidity around 90%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Corvallis is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Corvallis's day-to-day weather follows the broader pattern of Oregon described above. See the hourly weather forecast or the air quality index for more detail.