# Tennis: Wimbledon CEO Sally Bolton says the Grand Slam tournament was not used to baking summer temperatures, but they are ready for it. Temperatures are expected to climb to at least 33 degrees Celsius in London on the first day of the Championship. Wimbledon, often plagued by cool, damp weather, has a heat rule that it is ready to activate to safeguard players. It is based on a heat stress index that takes into account a number of factors, including air temperature, humidity and surface temperature.
Tennis: Wimbledon has heat rule in place as mercury soars in London