The higher the temperature the higher the "safe" humidity and lower temps, lower humidity.
There is a chart for it but i can't upload pictures and im not into transcribing 10000 numbers 1 by 1.
So temps like 35°C your gonna want 70/75% RH.
Temps like 20°C your gonna want 40/45% RH.
Its all about transpiration, people can tell you an exact value for RH for each stage but unless you keep the temperature at exactly inbetween 25°C and 28°C there is no point to lower the humidity if you have temperatures of 32 or 33°C because it would hurt the plant.
Got it?