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8. Adjust the humidity levels in the incubator. Humidity should be around 45 to 50 percent throughout incubation, except during the last three days when you will want to raise it to 65 percent. You may need higher or lower humidity levels depending on the type of eggs you wish to hatch.. Record the day and how many eggs you've incubated on a calendar. You should be able to estimate your hatch date based on average incubation times for the bird species you want to hatch. For example, chicken eggs typically take 21 days to hatch, whereas many duck varieties and peafowl may take 28 days.
Humidity is important, because it keeps the egg from losing too much or too little moisture during the incubation process. Humidity should be balanced with temperature, because different temperatures require different relative humidities. A table outlining the relationship can be found on p.15 of Beginning of Life.A. Relative humidity should be 60-65% for the first 18 days of incubation, and 70% for the last three days.he humidity should be 70% at this point, and opening the incubator would lower the humidity. If 70% humidity is not maintained the membranes could dry out too soon and trap the chick inside the egg and not allow hatch.