Eugene Weather in September

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

September is in the fall / autumn in Eugene and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a comfortable 25°C (76°F), whilst at night 9°C (48°F) is normal.

On average September is the 4th driest month of the year in Eugene with around 41mm 1.6 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 6 days, although this may vary considerably.

On the flip side this corresponds to an average of 9.6 hours of sunshine per day.

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 Eugene in September 2025.