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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.
Day 1 - 20 (Incubator) the temperature should be 99.4 F and the humidity should be 83-84 F wet bulb (53% relative humidity). Day 21 - 25 (Hatcher) the temperature should be 98 F and the humidity should be 83-84 F wet bulb (53% relative humidity).NOTES: 1  When chicks actively begin to hatch (approximately 23Â½ -24 days) increase humidity to 91 F wet bulb (75-76% relative humidity). When chicks actively begin to hatch (approximately 23Â½ -24 days) increase humidity to 91 F wet bulb (75-76% relative humidity). â 2 Actively hatchingâ is when the majority of the eggs are pipped and a few chicks may have already hatched but are still wet.