Climate Insights for Corvallis

The climate in Corvallis is temperate. The average annual temperature is 12°C and approximately 1227mm of precipitation falls per year. December is the wettest month, receiving around 195mm of rainfall. Corvallis is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, December, January, when temperatures can drop to 2°C. Light snow can occur between January and December.

Temperatures in Corvallis vary considerably across the year, with a 28°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 30°C and the mean temperature sits around 21°C. February is the coolest month, with minimum temperatures around 2°C and an average of 5°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Corvallis is a fairly wet location, receiving approximately 1227mm of precipitation annually, which averages out to around 102mm per month. The wettest month is December, averaging 195mm of rainfall. January and November also tend to see above-average precipitation. The driest month is July, with just 4mm. That's 191mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic. Light snowfall can occur between January and December, totalling around 25cm annually. February is the snowiest month with approximately 10cm.

Corvallis is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 8km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 1km/h between the calmest and windiest months.

It is currently summer in Corvallis, which began on June 21, 2026. Corvallis is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 30°C, while the coldest stretch bottoms out in February near 2°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Corvallis is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 23mm per month. By contrast, February can be quite cold with temperatures dropping to 2°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Corvallis based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.