Mianyang Weather in September

The climate in Mianyang during September can be summarized as warm, humid and wet.

September is in the fall / autumn in Mianyang and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (78°F), whilst at night 19°C (65°F) is normal.

On average September is the 3rd wettest month of the year in Mianyang with around 150mm 5.9 inches of rain making it a wet time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.

On the flip side this corresponds to an average of 3.6 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 Mianyang in September 2025.