I usually start my incubation humidity around 45% and I adjust it from there if the air cells are developing too slowly or quickly. 
Good luck on your hatch!
Good luck on your hatch!
BackYard Chickens - Learn How to Raise Chickens
CluckNDoodle
Kellyjenny
So you start it at 45 and gradually raise it at 45 until hatching
CluckNDoodle
You don't need to raise the humidity until you're ready for lockdown unless the air cells are growing too quickly, in which case you can increase the humidity slightly but in most cases, it's better to have slightly lower humidity rather than too high.
Kellyjenny
See that's what I thought 45 but other people are saying 50 to 60 and I know that's too high for the first 18 days and I have a problem that when I check on them before I go to bed it's fine. in the morning the humidity gos down way down and I start freaking out so I don't know should I put a little more water before I go to bed.
CluckNDoodle
50 won't hurt anything if that's where you want to start, I do think 60 is too high to start with for the first 18 days. It's easier to increase humidity, later on, to slow down weight loss than it is to increase weight loss in a shorter period of time.