The games scheduled on days of Heat Advisories will be played. In these high levels of heat and humidity, we recommend that coaches speak pre-game to the other coaches and game officials and determine how many water breaks you will provide during the game – and if more are needed, than agreed upon during pre-game discussions they will be added by the game official. Please remember that the safety of the players, and the officials is our main concern. Stay hydrated.
Here is a link to some help with preventing heat related injuries:
http://www.ontariosoccer.net/referee/severe-weather