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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.
The ideal temperature for hatching chickens or ducks in an incubator is between 99.5F and 100.5F. The temperature is not the only consideration as the humidity must be right also. Eggs should be at a 55% humidity rate through to the 18th day and raised to better than 65% during the final days.