Right now in Grand Rapids, the air is about 54°F, but the model estimates the asphalt under your dog's paws is closer to 54°F — the surface and air have nearly converged because the pavement is shedding the day's stored heat after dark. That reading puts Grand Rapids 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 18 hours left today, the pavement in Grand Rapids is projected to top out near 100°F around 3 PM, when the air will be about 71°F — a 29°F gap between the forecast your weather app shows and the surface your dog walks on. The surface is still gaining — up about 4°F over the next three hours — so a walk taken now is cooler than the same walk later this afternoon.
In an average October, Grand Rapids sees highs around 61°F and overnight lows near 45°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.
Grand Rapids loses its all-day safe window in 3 months of the year — June through August — and October is not one of them. The year peaks in July at an average high of 83°F against 32°F in January, a 51°F swing that decides how much of the day belongs to your dog.
The nearest place we track is Lansing, about 59 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 Grand Rapids'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 Grand Rapids 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.