Can humidity cause mold growth? Yes, high levels of humidity can lead to mold growth. The Centers for Disease Control recommends that humidity levels be kept below 50%. By ProMatcher Staff Updated: 08/08/2016 Next Question Source: CDC Next Question Find Local Pros Free Actuaries Cost Estimates Related Questions Where does mold grow? Is mold exposure bad for your health? What is mold abatement? Is it possible to completely eliminate mold from the inside of my home?Top answer: Never Is mold growth exponential? Top answer: Yes, mold growth is exponential.