the formula is copied & pasted into microsoft's program, excel
ideally, you'd want a heat gun to read your leaf temps to determine how hot or cool your plant is
i'll make a conclusion by basing it off:
the VPD formula
my room's conditions of +4 degrees Fahrenheit of leaf temp from grow room temp
89f air temp
93f leaf temp
you'll want 96-97% RH with good air flow for the optimal .78-.83 VPD range
at that high of RH you're at a higher risk of mold & powdery mildew. that can be negated with effective grow room ventilation
that's just so dang hot for your babies, man. if you can get a humidifier & some fans to gently blow the humidifier's cool mist straight onto your girl, that will help with your hot temps