Right now in McAllen, the air is about 98°F, but the model estimates the asphalt under your dog's paws is closer to 114°F — a gap of roughly 16°F, because clear skies are pouring full sun onto every dark surface. That reading puts McAllen in the caution range, where short, shade-hugging walks are the most a paw should take. Air temperature alone would have told you none of this — the pavement, not the forecast, is what your dog actually stands on.
Across the 5 hours left today, the pavement in McAllen is projected to top out near 114°F around 7 PM, when the air will be about 98°F — a 16°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is already coming down, about 26°F over the next three hours, so waiting a little works in your favour here.
In an average August, McAllen sees highs around 98°F and overnight lows near 80°F. At highs like that, sun-baked pavement can easily top 120–130°F by early afternoon, so the walkable hours cluster around dawn and after sunset. As a seasonal rule of thumb, the safest windows are before about 9:00 AM and after about 6:00 PM.
McAllen loses its all-day safe window in 8 months of the year — March through October — and August is one of them. The year peaks in August at an average high of 98°F against 73°F in January, a 25°F swing that decides how much of the day belongs to your dog.
The nearest place we track is Brownsville, about 50 miles away. That is close enough to move together in a heat wave but far enough that a passing cloud bank or a coastal breeze can put real distance between the two readings, so check McAllen's own page rather than assuming.
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. On a day reading this warm in McAllen, flat-faced breeds like pugs and bulldogs, plus seniors and young puppies with thinner pads, should sit out the heat entirely — subtract about 10°F from any safe threshold for them. If you must cross hot ground, protective booties or a quick coat of paw wax are the only real barrier between paw pads and the asphalt.