Corvallis Weather in September

What's the weather like in Corvallis (Oregon) in September 2025?

The climate in Corvallis during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Corvallis and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 9°C (48°F) is normal.

Corvallis weather averages (imperial / metric)
Daytime temperature 23.7°C 74.7°F
Nightly temperature 8.7°C 47.7°F
Average temperature 16.2°C 61.2°F
Daily sunshine 9.1 hrs
Avg rainfall 38 mm 1.5 ins
Rainy days 7 days
Sea temperature 14.5°C 58.1°F
Humidity 71%
Windspeed 11.5kph 7 mph

On average September is the 4th driest month of the year in Corvallis with around 38mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.1 hours of sunshine per day.

September temperatures in Corvallis

Corvallis average temperature in September

September rainfall

Corvallis average rain in September

September hourly sunshine

Corvallis average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Corvallis in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Corvallis weather stats

Corvallis weather statistics
Hottest month: August 26.3°C 79.3°F
Driest month: July 13mm 0.5ins
Sunniest month: July 11.8hrs
Coldest month: January 7.6°C 45.7°F
Wettest month: December 203mm 8ins
Map showing location of Corvallis (44.56457, -123.26204) Corvallis map pin © Google

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