Right now in Louisville, the air is about 82°F, but the model estimates the asphalt under your dog's paws is closer to 100°F — a gap of roughly 18°F, because clear skies are pouring full sun onto every dark surface. That reading puts Louisville 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 5 hours left today, the pavement in Louisville is projected to top out near 100°F around 7 PM, when the air will be about 82°F — a 18°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is already coming down, about 24°F over the next three hours, so waiting a little works in your favour here.
In an average August, Louisville sees highs around 86°F and overnight lows near 68°F. Even at those moderate highs, a dark surface in direct sun can run 40–60°F hotter than the air, which is enough to tip midday walks into the caution range. As a seasonal rule of thumb, the safest windows are before about 11:00 AM and after about 4:00 PM.
Louisville loses its all-day safe window in 5 months of the year — May through September — and August is one of them. The year peaks in July at an average high of 88°F against 44°F in January, a 44°F swing that decides how much of the day belongs to your dog.
The nearest city we track is Lexington, roughly 72 miles from Louisville — 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 Louisville 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 Louisville 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.