How do I decrease humidity in a terrarium?

Closed terrariums should have their airflow increased.Taking the lid off a closed terrarium and letting the air circulate is the fastest and safest way to reduce humidity. This should be done on a monthly basis. The less space a terrarium has to fill, the less air it requires.

Silky Terrier Dog Breed Playing Aro... Silky Terrier Dog Breed Playing Around

Is 70% humidity too high for ball python?

Because they are native to West and Central Africa, ball pythons are well-adapted to living in hot, humid conditions. In their natural habitat, the relative humidity ranges from 55 to 70%, but it can rise to over 80% in the morning. The ideal humidity level for ball pythons is between 55 and 60 percent.