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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.
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).