Right now in Santa Rosa, the air is about 49°F, but the model estimates the asphalt under your dog's paws is closer to 49°F — the surface and air have nearly converged because the pavement is shedding the day's stored heat after dark. That reading puts Santa Rosa 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 24 hours left today, the pavement in Santa Rosa is projected to top out near 108°F around 2 PM, when the air will be about 70°F — a 38°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is holding roughly flat over the next three hours, so there is no meaningfully cooler hour coming soon — choose shade and grass rather than waiting it out.
In an average October, Santa Rosa sees highs around 78°F and overnight lows near 53°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.
Santa Rosa 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 87°F against 58°F in December, a 28°F swing that decides how much of the day belongs to your dog.
The nearest place we track is Vallejo, about 34 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 Santa Rosa'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 Santa Rosa 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.