Notices. 1  2017-08-27: Support will be closed on Monday, September 4, 2017 for the Labor Day statutory holiday; we will reopen at 7am (Pacific) September 5. 2  2017-08-02: Introduction to Intranet Administration Webinar | September 6, 2017 | REGISTER NOW.
The weather varies greatly throughout the year in Las Vegas â the winter months are dry and cold with short days and long nights, whilst the summer months are blisteringly hot with long days and short nights. Las Vegas is located in Nevada in the Mojave Desert.
Average temperature in Las Vegas in September. According to the National Weather Service, the normal temperature in Las Vegas in September is 82.6 degrees. While still warm, this represents a nice cool down from the preceding month, as August weather in Las Vegas is much warmer, with a normal temperature of 90.6 degrees.