How much hotter is pavement than the air temperature?

In full sun, dark asphalt runs at least 10–15°C (≈20–25°F) hotter than the air — and clear-sky peak measurements go much further: asphalt near 52°C (125°F) with air at just 25°C (77°F), and around 62°C (144°F) with air at 31°C (88°F). Those are full-sun peaks, not a formula; shade on the same street at the same air temperature can be dramatically cooler. That spread is exactly why air temperature alone cannot answer "is it too hot for paws?"

Why is pavement still hot in the evening after the air cools?

Pavement is a heat store. It spends the day absorbing sun and releases that energy slowly, so the surface tracks its recent peak heating rather than the current air temperature. The air can drop quickly after sunset while the slab is still working off its mid-afternoon maximum — which makes early evening the deceptive window. The gap fades as hours pass; late evening and morning are the reliably cooler end.

How does Wyndo estimate pavement temperature?

From air temperature and measured sunlight, with the last few hours of sun weighted in (pavement remembers) and a deliberate worst-case margin — tuned to a typical concrete sidewalk, with dark asphalt called out as running roughly 10–15°C hotter. It is an estimate, not a sensor: real pavement can be 10–15°C hotter or cooler than the estimate depending on sun, shade, and surface, so the 7-second hand test is always the final word. When sunlight data is missing, Wyndo says "check first" rather than quietly assuming the cooler answer.

🐾 Paw Check by Wyndo · Guide

Pavement temperature vs air temperature

A 30°C (86°F) afternoon sounds walkable. Clear-sky measurements put asphalt above 60°C (140°F) with air in the low 30s °C — hot enough to burn paws in seconds. Here is where that gap comes from, why evenings are deceptive, and how Wyndo estimates a number no forecast reports. Informational, not veterinary advice.

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The measured gap

Air temperature is read in the shade, above the ground, by design — it describes the air, not the street. The street is running a different experiment. Under a clear summer sky, the field measurements behind Wyndo's model put asphalt near 52°C (125°F) when the air is 25°C (77°F), and around 62°C (144°F) when the air is 31°C (88°F). In the range where skin-contact burn research says seconds-to-minutes of contact injures skin, the air number still sounds like a nice day.

Two honest qualifiers. Those are clear-sky, full-sun peaks, not a formula you can apply to any afternoon — clouds, recent rain, and season all pull the surface down. And the spread within one street is as important as the average: at the same air temperature, full sun versus shade can swing the surface by roughly 25°C. The air-to-surface gap is not a fixed offset; it is driven by something the thermometer does not see.

Sun in, heat stored: why dark surfaces run hottest

That something is solar load. Sunlight delivers energy to whatever it lands on; a surface's temperature is the balance between what it absorbs and what it can shed back to the air. Dark surfaces absorb most of what arrives — that is what "dark" means — so fresh blacktop turns sunlight into stored heat all day. Lighter, more reflective surfaces bounce more of it away: a typical concrete sidewalk runs meaningfully cooler than asphalt beside it, and dark asphalt and parking lots run roughly 10–15°C (≈20–25°F) hotter than that sidewalk read. Artificial turf, metal, and dry sand can run hotter still, while grass sheds heat well and shade never receives the load in the first place — which is why grass and shade sit near the air temperature.

This is also why the gap collapses on overcast days: no direct sun, no solar load, and the surface drifts back toward the air temperature. The pavement problem is a sunshine problem that happens to correlate with warm days.

Pavement remembers: afternoons peak late, evenings cool slowly

A slab of asphalt has real thermal mass — it charges up like a storage heater and discharges slowly. So the surface does not track the sun in real time: it integrates the last several hours. Peak surface heat lands in mid-to-late afternoon, roughly 2–4pm, after hours of accumulated charge — not at solar noon when the sun is strongest.

The same physics makes early evening the trap for dog walkers. After sunset the air lets go of its heat quickly; the slab does not. The surface tracks its recent peak heating, not the current air, so a golden 7pm that feels ten degrees kinder than the afternoon can still have asphalt working off its 3pm maximum. The gap fades as the hours pass — late evening genuinely eases, and by morning the ground has had all night to discharge, which is what makes dawn the reliably cooler walk. Wyndo's estimator models this memory explicitly, weighting the last few hours of sun rather than the current instant, so its evening reads ease as the stored heat recedes instead of vanishing the moment the sun sets.

How Wyndo estimates it — and what an estimate can't know

No forecast reports pavement temperature, so Wyndo estimates it: air temperature plus measured sunlight, with the last few hours weighted in for thermal memory, and a deliberate worst-case margin on top — so a warm, sunny afternoon gets flagged before paws get hurt. The estimate is tuned to a typical concrete sidewalk (the surface most walks actually happen on), and every read carries the caveat that dark asphalt and parking lots run roughly 10–15°C hotter — hand-test those. If the sunlight data is missing or stale on a warm day, Wyndo says "check first" instead of quietly assuming the cooler answer.

And plainly: it is an estimate, not a sensor. Real pavement can be 10–15°C hotter or cooler than the estimate depending on sun, shade, and surface — your street's shade line and your crosswalk's fresh blacktop are invisible to any model. That irreducible uncertainty is why the read is concern-based, never a green light, and why every Wyndo paw surface ends with the same instruction: do the 7-second hand test on the actual surface. For what the surface temperatures mean for paws — the burn thresholds and when to skip entirely — see how hot is too hot for dog paws; for the separate whole-dog hazard, see heatstroke signs on walks.

See the estimate for your street

The live Paw Check runs this exact model for your location right now — pavement heat estimated conservatively, whole-dog heat checked separately, reasoning shown, hand test always the final word.

Check your location right now Pavement heat by city

Pavement-heat questions, answered honestly

How much hotter is pavement than the air temperature?: In full sun, dark asphalt runs at least 10–15°C (≈20–25°F) hotter than the air — and clear-sky peak measurements go much further: asphalt near 52°C (125°F) with air at just 25°C (77°F), and around 62°C (144°F) with air at 31°C (88°F). Those are full-sun peaks, not a formula; shade on the same street at the same air temperature can be dramatically cooler. That spread is exactly why air temperature alone cannot answer "is it too hot for paws?"
Why is pavement still hot in the evening after the air cools?: Pavement is a heat store. It spends the day absorbing sun and releases that energy slowly, so the surface tracks its recent peak heating rather than the current air temperature. The air can drop quickly after sunset while the slab is still working off its mid-afternoon maximum — which makes early evening the deceptive window. The gap fades as hours pass; late evening and morning are the reliably cooler end.
How does Wyndo estimate pavement temperature?: From air temperature and measured sunlight, with the last few hours of sun weighted in (pavement remembers) and a deliberate worst-case margin — tuned to a typical concrete sidewalk, with dark asphalt called out as running roughly 10–15°C hotter. It is an estimate, not a sensor: real pavement can be 10–15°C hotter or cooler than the estimate depending on sun, shade, and surface, so the 7-second hand test is always the final word. When sunlight data is missing, Wyndo says "check first" rather than quietly assuming the cooler answer.
Which surfaces get hottest in the sun?: Dark asphalt and parking lots are the hot end of common walking surfaces, and artificial turf, metal, and dry sand can run hotter still. A typical concrete sidewalk runs meaningfully cooler than asphalt, and grass and shade are the cool end, usually near the air temperature. Judge a route by its worst stretch and hand-test that surface.

Who wrote this

Wyndo — a weather decision engine, not a veterinary clinic, and we say so plainly. The estimator described above is the one we actually ship, and its limits are stated here the same way they are stated in the product. Everything here is informational, not veterinary advice: the hand test and your own dog are the final word.