The 2026 French Open has been marked not only by early upsets but also by dangerous heat conditions affecting players and on-court staff.During the first week of the tournament at Roland Garros, multiple incidents raised concerns about athlete safety, including a ball girl nearly fainting and a men’s player collapsing after a long five-set match.

These events occurred under temperatures in the low to mid-90s Fahrenheit, driven by a persistent heat dome over Europe that traps warm air and intensifies heat stress.

The article explains that the key to understanding the severity of these conditions is the wet bulb globe temperature (WBGT), a composite metric that accounts for temperature, humidity, solar radiation, and wind.Unlike standard air temperature, WBGT reflects how effectively the human body can cool itself through sweat evaporation.When WBGT reaches around 86°F (30°C), conditions become dangerous for human health, as sweat evaporation becomes less effective.Research cited in the article shows that even healthy, young individuals can begin to experience physiological stress near 88°F (31°C) WBGT.

Athletes may have some advantages, such as higher cardiovascular fitness and better heat acclimatization, but they are still vulnerable without proper rest and cooling.Strategies like shade breaks, ice packs, and extended rest periods can help reduce risk.The French Tennis Federation reportedly uses WBGT measurements on-site to guide decisions such as delaying play or extending breaks.

The piece also notes that other major tennis tournaments, including Wimbledon, the US Open, and the Australian Open, already incorporate heat protocols based on WBGT thresholds.

Broader climate research suggests that such extreme heat conditions may become increasingly common across many regions in the coming decades, raising concerns about outdoor sports and labor under warming global conditions.

Ultimately, the article frames the situation at Roland Garros as both an immediate health challenge and a preview of how climate change may increasingly impact outdoor athletic events worldwide.