SINGAPORE, Oct. 8 -- The Singapore Grand Prix has been declared a heat-hazard race, with temperatures forecast to exceed 31degC during the sprint and race.

"In accordance with Article B1.5.10 of the FIA F1 Regulations, having received a forecast from the official weather service predicting that the heat index will be greater than 31degC at some time during the sprint or race at this event, a heat hazard is declared for both the sprint and race," a statement from FIA F1 race director Rui Marques reads.

Heat hazards can be declared if pre-weekend weather forecasts predict temperatures of 31degC or above at some point during a sprint or race.

Teams are then notified of the declaration by the FIA and subsequently must fit a Driver Cooling ...