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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.
1 Upon receving your eggs, let your eggs set at 50 to 60 degrees room temperature (do not refrigerate). Eggs should set for 6 to 12 hours prior to putting into your incubator.  Temperature should be set according to your incubators' manual. Temperatures above are for forced air incubators.