Singapore Grand Prix Declared Heat Hazard for Fourth Time This Season

The Singapore Grand Prix has officially been declared a heat-hazard race, marking the second consecutive weekend and the fourth instance this season that Formula 1 has applied this designation.

The heat hazard status permits teams to equip their cars with specialized cooling devices. These systems pump a liquid through a vest worn by the driver to help manage the extreme temperatures experienced within the cockpit.

A heat hazard is officially declared when race temperatures are forecast to exceed 31 degrees Celsius (87.8 degrees Fahrenheit) at any point during the event. This measure was first introduced in 2025.

Singapore, situated close to the equator, is renowned for presenting one of the most physically demanding races on the Formula 1 calendar. In 2024, Mercedes drivers George Russell and Lewis Hamilton required treatment for heat exhaustion following the Grand Prix.

During the race weekend, temperatures in the city typically hover between 31-33 degrees Celsius. Despite the race being held at night, cockpit temperatures can remain around 30 degrees Celsius even after dark, exacerbated by high humidity and a daily chance of rain.

While the use of a cooling kit is optional, drivers who opt out must carry an additional 5 kilograms (11 pounds) of ballast to prevent gaining a competitive advantage.

The cooling system involves a cooling tank and pump, often located in the car's nose, which circulates a cooled liquid, such as glycol, through pipes embedded in a fireproof top worn beneath the driver's racing suit.

However, some teams and drivers choose not to utilize the system due to two primary challenges. Maintaining the liquid's coolness for the entire duration of a Grand Prix can be difficult, a problem amplified in Singapore, which hosts the longest race on the calendar. Additionally, some drivers find the cooling vest to be uncomfortable within the confined space of the cockpit.

If the liquid's temperature rises significantly, it can revert to the car's internal temperature, which is considerably higher than ambient. Cockpit temperatures can often exceed 40 degrees Celsius (104 degrees Fahrenheit).

Mercedes has previously opted against using the system, preferring to allocate resources towards enhancing car performance rather than developing a robust cooling solution. According to Mercedes' deputy team principal Bradley Lord, the $50,000 allowance provided by the FIA for developing a system capable of keeping liquid cool for an entire Grand Prix, and an additional $75,000 for making the vest comfortable, was deemed insufficient for their development needs.

Prior to Singapore, the Austrian, Italian, and Malaysian Grands Prix this season were also declared heat-hazard races.