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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).ertile chicken eggs can be stored up to 10 days (before incubating) with little loss in hatchability â as long as you keep them out of the refrigerator.
In the adult chicken the variability is between 105Â°F and 107Â°F (40.6Â° and 41.7Â°C). The body temperature of a newly hatched chick is about 103.5Â°F (39.7Â°C), and increases daily until it reaches a stable level at about three weeks of age. Smaller chicken breeds have a higher body temperature than larger breeds.