Port Isabel Weather in September

The climate in Port Isabel during September can be summarized as hot, humid and wet.

September is in the fall / autumn in Port Isabel and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 32°C (90°F), whilst at night 23°C (73°F) is normal.

On average September is the wettest month of the year in Port Isabel with around 144mm 5.7 inches of rain making it a wet time to visit. This rainfall is typically spread over 10 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.8 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 Port Isabel in September 2024.