Understanding the Heat Rules at the French Open

This year’s French Open has faced some serious heat, with temperatures hitting 32°C (90°F) for five straight days. Yet, the tournament’s strict heat policy hasn’t kicked in. That’s because the Wet Bulb Globe Temperature (WBGT)—a measure that combines heat, humidity, and sunlight—hasn’t hit the required levels. A WBGT of 30. 1°C (86°F) triggers cooling breaks between sets, while 32. 2°C (90°F) would pause play entirely. During Jannik Sinner’s loss, the temperature climbed from 29°C to 32°C, but the WBGT didn’t cross the threshold.The French Open’s approach to extreme heat differs from other Grand Slams. Unlike the Australian Open, which can close roofs during matches, Roland Garros keeps its retractable roofs shut unless they were already closed before play began. This means players and fans have no escape from scorching conditions during daytime matches. With heat waves becoming more common, critics wonder if this policy needs updating. Some players, like Novak Djokovic, have suggested shifting more matches to cooler evening hours. Djokovic argued that closing roofs on select courts creates an unfair advantage for those playing indoors. He believes Grand Slams have enough courts to reschedule matches without disrupting fairness. The debate raises questions: Should the French Open adapt to rising temperatures, or is the current system good enough?