Right now in Tucson, the air is about 81°F, but the model estimates the asphalt under your dog's paws is closer to 81°F — the surface and air have nearly converged because clear skies are pouring full sun onto every dark surface. That reading puts Tucson 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 Tucson is projected to top out near 160°F around 1 PM, when the air will be about 108°F — a 52°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, Tucson sees highs around 99°F and overnight lows near 77°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.
Tucson 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 June at an average high of 101°F against 63°F in January, a 38°F swing that decides how much of the day belongs to your dog.
The nearest city we track is Chandler, roughly 92 miles from Tucson — far enough that its reading is no substitute for this one. Sun angle, humidity and cloud cover can all differ across that distance, which is why this page models Tucson on its own coordinates.
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 Tucson 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.