Right now in Santa Rosa, the air is about 60°F, but the model estimates the asphalt under your dog's paws is closer to 75°F — a gap of roughly 15°F, because heavy cloud cover is taking some of the edge off the direct sun. 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 15 hours left today, the pavement in Santa Rosa is projected to top out near 135°F around 1 PM, when the air will be about 89°F — a 46°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 August, Santa Rosa sees highs around 87°F and overnight lows near 58°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.
Santa Rosa loses its all-day safe window in 5 months of the year — May through September — and August is 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.