Right now in Arlington, the air is about 83°F, but the model estimates the asphalt under your dog's paws is closer to 108°F — a gap of roughly 25°F, because a mix of sun and cloud is still loading heat into the asphalt. That reading puts Arlington in the clear for an ordinary walk. Humidity is nudging the human "feels-like" to about 87°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 11 hours left today, the pavement in Arlington is projected to top out near 119°F around 2 PM, when the air will be about 86°F — a 33°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 October, Arlington sees highs around 80°F and overnight lows near 60°F. Those are forgiving numbers, but don't let them lull you — a sunny, still afternoon can still heat dark asphalt far above the air, especially for low-riding or short-coated dogs. For this month the normals suggest pavement rarely reaches unsafe temperatures here, but the seven-second hand test is still the final word on any given day.
Arlington loses its all-day safe window in 5 months of the year — May through September — and October is not one of them. The year peaks in August at an average high of 97°F against 57°F in January, a 40°F swing that decides how much of the day belongs to your dog.
Arlington sits about 6 miles from Grand Prairie, 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. Conditions in Arlington 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.