Formula One has declared a heat hazard for this weekend’s Italian Grand Prix at Monza, requiring teams to prepare additional cooling equipment for drivers as temperatures are forecast to climb above 31 degrees Celsius (88 degrees Fahrenheit).

Race Director Rui Marques announced the designation after the official weather forecast predicted a heat index exceeding 31 degrees Celsius during Sunday’s race. It is the second time this season the FIA has activated its heat-hazard protocol, following the Austrian Grand Prix in June.

Temperatures around Monza, northeast of Milan, are expected to reach the mid-30s Celsius during the weekend, with forecasts calling for highs of about 33 to 35 degrees Celsius on race day. Temperatures near Milan’s Linate airport reached 36 degrees Celsius earlier in the week.

The conditions could make an already demanding race even more difficult for drivers. Cockpit temperatures can rise well above the outside temperature because of heat generated by the power unit, restricted airflow and the multiple layers of fireproof clothing drivers wear.

What the heat hazard means