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Perhaps the most important parameter is temperature â chicken eggs should be incubated at a temperature between 99 and 102 degrees Fahrenheit (99.5 is often considered to be ideal) and 50 to 65 percent relative humidity (60 percent is often considered the ideal).uring the final three days of incubation, the eggs should ideally be located in a slightly cooler (98.5 degrees) and more humid (65 percent relative humidity or greater) environment to facilitate successful hatching.
Start incubator several hours before adding the eggs to make sure the temperature stabilizes at 98â99.9 Â°F (36.7â37.7 Â°C) and Humidity at 30-50%. I have found that starting my incubator 24 hours before usually allows plenty of time for all the minor adjustments to be made prior to incubation of the eggs.tart incubator several hours before adding the eggs to make sure the temperature stabilizes at 98â99.9 Â°F (36.7â37.7 Â°C) and Humidity at 30-50%. I have found that starting my incubator 24 hours before usually allows plenty of time for all the minor adjustments to be made prior to incubation of the eggs.