In September, Las Vegas typically sees daytime highs of 34.6°C and overnight lows around 18.2°C. Compared to the annual average high of 26.6°C, September runs +8.0°C.
September in Las Vegas averages a daytime high of 34.6°C and an overnight low of 18.2°C.
September runs +8.0°C compared to Las Vegas's annual average high of 26.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 34.6°C and cooler evenings around 18.2°C.