I lived in Vegas for eight years 1995-2003, and it NEVER got that hot this early in the year. While the highs usually got over 100, it usually wasn't until August that the temps cracked 110. But now, the forecast high for Tuesday is 114! Jesus!
I can tell you that there's a huge qualitative difference between temps over 110 and "only" over 100. With the latter, you can still manage to go outside; as long as you avoid the heat of midday, you can get things done; and the nights are pleasant. But when it gets to be 114+ outside, there's so much raw power coming down from the sky that all you can do is hide from it. It becomes impossible to do anything at all outside, including going for a walk. Driving is hell--your car's interior when parked can get over 175 degrees, and yeah, you have a/c, but it often can't cope with the task, and at any rate, you have the brutal sun blasting its heat through your car windows, with glare in your eyes.
I would recommend staying away from Vegas this summer. You might say yeah, everything's air-conditioned, so, so what, but the truth is, you'll have many unpleasant moments where you can't avoid exposure. Just taking your bags out to the valet, you'll be drenched in sweat as soon as you step outside. And of course, you can't use the swimming pool--the water will be over 90 degrees and the patio around the pool will be like a pizza oven. And if you're navigating the airport...wait in line outside for a taxi for 20 minutes and you'll start to regret your decision to come here.
Good thing that Deep State Chinese fake news liberal hoax global warming isn't real, or this would be something serious.