When the temperature inside the incubator fluctuates up or down, it can lead to poor hatch rates, so it's important to address the issue immediately. You should try to get the temperature back to the number you set, but it's essential to do so gradually. You should also keep in mind that it will take a while for the center of the egg inside the incubator to match the air temperature. If. The average temperature of the incubator is too low, the chicks may be late to hatch or in some cases they may not hatch at all, so it's essential to keep an eye on it.