Hi @Anonymous ok so I think I'm slowly piecing together what you're doing.
You're getting heat/humidity information from the weather actions and then feeding those values into a SharePoint list. I'm assuming that you are then using a calculated column within SharePoint to calculate the humidex, and this is the value you're trying to pull back into Flow to use within your email. Is this correct?
So I have successfully managed to retrieve the value of the calculated column from the list, but if you're pulling it out into a variable you need to treat it as a string. Then you can transform it and use it in your email.