Las Vegas Weather in September

The climate in Las Vegas during September can be summarized as hot and very dry.

September is in the fall / autumn in Las Vegas and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a warm 34°C (94°F), whilst at night 19°C (65°F) is normal.

On average September is the 3rd wettest month of the year in Las Vegas with around 10mm 0.4 inches of rain making it a very dry time to visit.

On the flip side this corresponds to an average of 12 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 Las Vegas in September 2025.