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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.
General Hatching rules for chicken eggs. 1  Don't set fewer than six eggs. 2  Chicken eggs take twenty-one days to hatch when incubated at optimal temperature. 3  Still-air incubator temperature should be 101.5, measured at the top of the egg, while forced-air (or turbofan) incubators should keep a temperature of 99.5. Still-air incubator temperature must be higher because the non-moving air inside the incubator rests in layers, cooler at the bottom of the incubator and warmer at the top.