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.
Weather in Las Vegas in September. The average maximum daytime temperature in Las Vegas in September is a very hot 35Â°C (95Â°F) with high heat & humidity. There are usually 11 hours of bright sunshine each day, which represents 90% of the 12 hours of daylight.