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The relative humidity in the incubator between setting and three days prior to hatching should remain at 58-60% or 84-86 degree F., wet-bulb. When hatching, the humidity is increased to 65% relative humidity or more.An excellent method to determine correct humidity is to candle the eggs at various stages of incubation. The normal size of the air cell after 7, 14, and 18 days of incubation for a chicken egg is shown.or still-air incubators, add 2-3 degrees F. 2 Measured as degrees F. using a wet-bulb thermometer. Use chart to convert to relative humidity. Sanitation In large commercial incubators, eggs of different ages are often set and each setting transferred to a separate unit prior to hatching.
Temperature and Humidity This is plain and simple, yet the MOST important part of hatching. Still-air incubator (no fan): 38.5 degrees measured at the TOP of the eggs. Fan Forced incubator: 37.5 degrees measured anywhere in the incubator. Humidity: 40-50% during incubation, 50-65% for the last 3 days.You can sneak by with humidity numbers that aren't very accurate, but the combination of poor humidity and temperature will definitely cause problems at hatch time. If your temperature is not accurate you will DEFINITELY have problems at hatch time.he temperature inside the egg will be an average of this temperature swing in your incubator. Turning During the period of incubation your eggs will need to be turned. There are three main ways this is done, manually, semi-automatic, or fully automatic.