Right now in Las Vegas, the air is about 85°F, but the model estimates the asphalt under your dog's paws is closer to 85°F — the surface and air have nearly converged because the pavement is shedding the day's stored heat after dark. That reading puts Las Vegas in the clear for an ordinary walk. Air temperature alone would have told you none of this — the pavement, not the forecast, is what your dog actually stands on.
Across the 18 hours left today, the pavement in Las Vegas is projected to top out near 160°F around 2 PM, when the air will be about 110°F — a 50°F gap between the forecast your weather app shows and the surface your dog walks on. Today breaks into 2 separate safe stretches rather than one continuous window, so missing the first does not cost you the day.
In an average August, Las Vegas sees highs around 104°F and overnight lows near 80°F. That is genuinely dangerous territory for daytime walks: at those highs, midday asphalt in full sun can push well past 130°F, hot enough to blister a paw pad in seconds. As a seasonal rule of thumb, the safest windows are before about 9:00 AM and after about 7:00 PM.
Las Vegas loses its all-day safe window in 7 months of the year — April through October — and August is one of them. The year peaks in July at an average high of 107°F against 58°F in January, a 50°F swing that decides how much of the day belongs to your dog.
Las Vegas sits about 2 miles from North Las Vegas, close enough that the two usually run within a degree or two of each other — if your walk crosses between them, either page answers the question. Street-level conditions still differ more than city-level ones do: a shaded side street and an open parking lot half a block apart can be twenty degrees apart underfoot.
Whatever the number says, confirm it with your hand: press the back of it flat on the pavement for seven seconds. If you can't hold it there, neither can your dog. Conditions in Las Vegas are on the gentler side right now, but keep the same habits: water before and after, grass over asphalt, and a close eye on flat-faced breeds, seniors, and puppies, who overheat and burn sooner than a healthy adult dog.