Right now in Port Saint Lucie, the air is about 94°F, but the model estimates the asphalt under your dog's paws is closer to 144°F — a gap of roughly 50°F, because clear skies are pouring full sun onto every dark surface. That reading puts Port Saint Lucie in the danger range, where pavement can scald paw pads in under a minute. Humidity is nudging the human "feels-like" to about 98°F, which matters for your dog too: muggy air makes it harder for a panting dog to shed heat, so treat a borderline reading as the hotter of the two.
Across the 9 hours left today, the pavement in Port Saint Lucie is projected to top out near 144°F around 3 PM, when the air will be about 94°F — a 49°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is already coming down, about 40°F over the next three hours, so waiting a little works in your favour here.
In an average August, Port Saint Lucie sees highs around 89°F and overnight lows near 76°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 10:00 AM and after about 5:00 PM.
Port Saint Lucie 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 July at an average high of 89°F against 73°F in January, a 16°F swing that decides how much of the day belongs to your dog.
The nearest place we track is West Palm Beach, about 44 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 Port Saint Lucie'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 Port Saint Lucie, 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.