Humboldt Weather in September

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

September is in the fall / autumn in Humboldt and is typically the 5th warmest month of the year. Daytime maximum temperatures average around a cool 17°C (62°F), whilst at night 5°C (40°F) is normal.

On average September is the 5th wettest month of the year in Humboldt with around 38mm 1.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.5 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 Humboldt in September 2025.