Johnson City Weather in September

The climate in Johnson City during September can be summarized as hot and a little damp.

September is in the fall / autumn in Johnson City and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 32°C (89°F), whilst at night 18°C (65°F) is normal.

On average September is the 2nd wettest month of the year in Johnson City with around 98mm 3.9 inches of rain making it a a little damp 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 8.3 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 Johnson City in September 2025.