Drivers are being urged to check their tyre pressure immediately as the UK prepares for a severe heatwave, with temperatures forecast to reach nearly 40°C. The Met Office has issued an unusual red extreme heat warning for parts of England and Wales, with highs of 37°C expected in southern England and 35°C in southeast Wales on Tuesday, climbing to at least 39°C by Wednesday and Thursday. The amber and red alerts are due to high humidity and record-setting daytime and nighttime temperatures, posing a serious risk to life.
Why Tyre Pressure Matters in a Heatwave
Extreme heat causes the air inside tyres to expand, leading to overinflation. This can reduce grip, cause uneven tread wear, and significantly increase the risk of a blowout at high speeds. According to Halfords, it is crucial to regularly check and adjust tyre pressure, especially before hot weather arrives.
The Met Office stated: "The heat will build further into Tuesday, with highs of 37C forecast for southern England and 35C in southeast Wales. The peak of the heatwave is now forecast for Wednesday and Thursday, when temperatures are expected to climb to at least 39C and there remains a chance of this being exceeded in places. By Friday conditions will be less hot, with highs of 32C forecast across eastern areas."
How to Check Tyre Pressure Correctly
Drivers should check the manufacturer's recommended tyre pressure, typically found on a sticker inside the driver's door frame or on the fuel cap. The owner's manual is another reliable source. Some newer models display the recommended pressure on the dashboard. Always check tyre pressure when the tyres are cold—meaning the car hasn't been driven for at least three hours. Don't forget to check the spare tyre as well, as it can gradually lose pressure over time.
If the pressure is low, use an air compressor to inflate to the recommended level. If too high, release excess air using a pressure gauge or by pressing the valve stem pin with a screwdriver. For every 10°C increase in temperature, tyre pressure typically rises by roughly 0.1 bar (1.45 PSI). Specialists at Protyre advise checking tyre pressure more regularly during hot weather, particularly throughout heatwaves.
Signs of Overheated Tyres
Tyres absorb heat efficiently due to their materials and black colour. If they feel hot to the touch, they may be nearing the point of overheating. In that case, cease driving and allow them to cool down. Releasing some air might help, but be cautious as this could lead to underinflation once temperatures drop.
