Here in the KC area we routinely play the end of June, beginning of July, in 100-105 heat index and the same in September. The key is to get the players to start hydrating 24 hours before they are to play and to keep hydrating during the games. We tell the girls if you think you have had enough to drink, drink more.
We have our team drink Gatorade style drinks the night before, tell them to have carbs the night before and proteins the day of the game. Game day we want them to drink water and more water. We have had a girl have heat issues twice and that was because the first time she did not start hydrating the day before and the second time because her parents let her go to the pool early in the day and she didn't drink anything while at the pool.
The parents go down a lot more often than the girls.
Disclaimer: I am not a doctor, do not claim to be one, this is the internet and if you are here for medical advice you get what you pay for. However, this is what has worked for us.
We have our team drink Gatorade style drinks the night before, tell them to have carbs the night before and proteins the day of the game. Game day we want them to drink water and more water. We have had a girl have heat issues twice and that was because the first time she did not start hydrating the day before and the second time because her parents let her go to the pool early in the day and she didn't drink anything while at the pool.
The parents go down a lot more often than the girls.
Disclaimer: I am not a doctor, do not claim to be one, this is the internet and if you are here for medical advice you get what you pay for. However, this is what has worked for us.