Weslaco Weather in September

The climate in Weslaco during September can be summarized as very hot, humid and wet.

September is in the fall / autumn in Weslaco and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a steamy 33°C (92°F), whilst at night 23°C (74°F) is normal.

On average September is the wettest month of the year in Weslaco with around 124mm 4.9 inches of rain making it a wet 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 8.2 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 Weslaco in September 2025.