Right now in Boulder, the air is about 63°F, but the model estimates the asphalt under your dog's paws is closer to 63°F — the surface and air have nearly converged because the pavement is shedding the day's stored heat after dark. That reading puts Boulder 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 20 hours left today, the pavement in Boulder is projected to top out near 113°F around 12 PM, when the air will be about 78°F — a 36°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, Boulder sees highs around 62°F and overnight lows near 37°F. That keeps most of the day walkable, though a rare clear, calm afternoon can still warm exposed pavement more than the mild air suggests. 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.
Boulder loses its all-day safe window in 4 months of the year — June through September — and October is not one of them. The year peaks in July at an average high of 86°F against 37°F in February, a 49°F swing that decides how much of the day belongs to your dog.
The nearest place we track is Westminster, about 17 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 Boulder'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. Conditions in Boulder 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.