Ok, back to reality. Start hydrating
yesterday. This means your kids drinking enough water that they have to pee every hour or two.
You can't just look at the day's
highest relative humidity (RH) and combine it with the expected
high temperature. Weather doesn't work this way. Generally, the day's highest RH will coincide with the day's
lowest temperature, and vice versa. So you have to look at the
hourly forecast and compare the temperature with the RH in that hour.
So, eg:
NORCO SATURDAY
Saturday forecast high of 95, between 2-3 pm. Forecast humidity of 26%. Using chart
here, you get a heat index of under 100 which is less than the "NO PLAY" index of over 105. (Weather.com also shows the "feels like" temp of 100 which is roughly the heat index, so you don't really need the chart.)
Now Sunday's high temp (disregarding humidity) is 107, so clearly late afternoon games will exceed the 105 level and will have to be cancelled.
As for Galway downs, based on the forecast, it looks like there is only a possibility that it would exceed 105 heat index for less than an hour on Sunday.