I think everyone realizes Las Vegas is pretty hot but if your coming to visit Las Vegas for the first time and its between the months of May - September, be ready for some extreme heat! I would not suggest doing any kind of walking down the strip during the day. Make sure you drink plenty of fluids and remember to bring Sun Protection products such as Sun Hats or Sun Clothes that are designed to protect you from the sun.

Heres an article from a Las Vegas news station about the dangers of the las vegas heat.

Las Vegas has so much to offer and its still tons of fun even in the summer but just remember to plan your trip accordingly if your visiting during the summer months.