How Track Temperature Is Measured And Used

Track temperature is reported alongside air temperature at every session, and the two frequently differ substantially. The asphalt reading is the one that decides how a tyre will behave.

Asphalt heats far beyond the air

Dark surfaces absorb solar radiation efficiently and re-radiate it slowly, so a circuit in direct sun runs far hotter than the air above it.

Cloud cover passing over a track can drop the surface reading sharply within minutes while the air reading barely moves.

That is why teams watch the sky as closely as the forecast during a session.

Measurement is continuous and distributed

Infrared sensors mounted around the circuit read the surface without contact, and readings are taken at several points because a lap includes shaded and exposed sections.

Teams also measure the temperature of their own tyres, both at the surface and internally, since those are the values that determine grip.

The relationship between track temperature and tyre temperature is what a team actually models across a stint.

Tyres have a working window

A compound produces its designed grip only within a temperature range, and it underperforms both below and above that band.

Too cold and the rubber is stiff and tears rather than keying into the surface; too hot and it becomes greasy and degrades rapidly.

A hot track pushes soft compounds out of the window and makes harder ones viable, which is why compound choice reads differently on a cool morning.

Setup follows the reading

Cooling requirements change with ambient conditions, and a hot day forces more open bodywork, which costs aerodynamic efficiency.

Suspension and aerodynamic settings are adjusted to manage how much energy is put into the tyres over a lap.

Because sessions occur at different times of day, a car optimised for a cool qualifying hour may be poorly matched to a hot race afternoon.

Evening events change the whole picture

Races run under lights start with a falling surface temperature and continue falling through the event.

Falling temperatures make it harder to keep tyres in the window, particularly during safety car periods when there is no energy going into them.

Teams therefore run practice sessions at the same hour as the race, since data gathered in afternoon heat would not describe the conditions they will actually face.

Surface temperature also governs how readily rubber bonds to the asphalt, so a cool evening circuit builds grip more slowly across a weekend than the same layout would in daytime heat.