Right now in Downey, the air is about 96°F, but the model estimates the asphalt under your dog's paws is closer to 146°F — a gap of roughly 50°F, because clear skies are pouring full sun onto every dark surface. That reading puts Downey in the danger range, where pavement can scald paw pads in under a minute. Humidity is nudging the human "feels-like" to about 100°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 10 hours left today, the pavement in Downey is projected to top out near 146°F around 2 PM, when the air will be about 96°F — a 50°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is already coming down, about 25°F over the next three hours, so waiting a little works in your favour here.
In an average August, Downey sees highs around 88°F and overnight lows near 66°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.
Downey loses its all-day safe window in 6 months of the year — April through September — and August is one of them. The year peaks in August at an average high of 88°F against 66°F in January, a 22°F swing that decides how much of the day belongs to your dog.
Downey sits about 4 miles from Norwalk, 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. On a day reading this warm in Downey, 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.