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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.
When raising chickens eggs, this rises to 65% - 70% Relative Humidity for the final 3 days prior to hatching (equivalent to wet bulb thermometer readings of 90Â°F [32Â°C] to 93Â°F [34Â°C]). The higher humidity levels at this time keep the egg membranes soft and easy for the hatching chickens to escape from. For hatching duck eggs at this stage a much higher relative humidity of 80% is needed (93Â°F wet bulb at a temperature of 99.5 Â°F).