Saint Simons Weather in September

The climate in Saint Simons during September can be summarized as hot, humid and wet.

September is in the fall / autumn in Saint Simons and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 29°C (84°F), whilst at night 22°C (71°F) is normal.

On average September is the wettest month of the year in Saint Simons with around 180mm 7.1 inches of rain making it a wet time to visit. This rainfall is typically spread over 11 days, although this may vary considerably.

On the flip side this corresponds to an average of 8 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 Saint Simons in September 2025.