The weather in Las Vegas can get pretty hot in July. The average daytime temperatures range from around 97°F (35.9°C) to 106°F (41°C), and at night it finally cools down to around 80°F (26.6°C) just before sunrise. If you plan to spend your Las Vegas vacation walking the Strip and downtown areas, July is probably too hot to do so comfortably.
https://www.feelingvegas.com/is-las-vegas-too-hot-to-visit-in-july/