With UK temperatures now regularly reaching 30°C or more during summer heatwaves, many motorists begin to wonder whether the hot weather could damage their tyres or whether they should adjust their tyre pressures.
The good news is that modern tyres are designed to cope with warmer conditions. However, incorrect tyre pressures, poor maintenance and carrying extra holiday luggage can all affect tyre performance, fuel economy and lifespan.
To separate fact from fiction, we spoke to Joe Brammer, CES Technical Manager at Michelin, who explained how hot weather affects tyre pressure, tyre wear, fuel economy and overall tyre performance.
Does hot weather increase tyre pressure?
Yes. As temperatures rise, the air inside your tyres expands, causing tyre pressures to increase naturally. Tyres also generate heat while driving, which further raises the pressure.
Joe Brammer says this is completely normal.
"Tyre pressure naturally rises as the air inside the tyre heats up, particularly when being driven on, and in most cases this is normal. It is estimated that for every 10°C change in temperature, tyre pressure can change by 1–2psi."
While drivers may notice slightly higher tyre pressures during a UK heatwave, Michelin says there's no need to let air out simply because the weather is warmer.
Instead, he advises checking tyre pressures regularly throughout the year.
"Regardless of the weather conditions, Michelin's recommendation is that drivers should check their tyre pressures at least once a month (or before a long journey) and set them to their vehicle manufacturer's specification depending on the load of the vehicle."
Importantly, tyre pressures should always be checked when the tyres are cold, not immediately after driving, as warm tyres will naturally display higher readings.