The correct humidity for pet Bearded dragons

Supplying the correct humidity for pet Bearded dragons
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There are two main environmental variables Bearded dragon keepers need to ensure (i.e. temperature and light), but what about humidity? Although, admittedly, often not something to worry about, incorrect humidity in an enclosed environment can lead to all sorts of problems.

What is humidity?

The humidity is basically the amount of water, in the form of vapour, in the air. In more technical terms it can be expressed as the relative humidity which is the amount of vapour in the air as a percentage of the space of air that can hold vapour. Higher percentages means higher humidity and vice versa.

Relative humidity
Visual example of relative humidity (RH). The area above the water source represents the air in which water can evaporate and the particles represents the air particles. Image from

Think of a Bearded dragon enclosure as a closed space of air, and the humidity as the amount of water in that space. Being enclosed, that area’s humidity will be different from the room the enclosure is situated at.

Factors affecting humidity

Apart from the size or the area for water to evaporate in (which is usually relatively small in the case of Bearded dragon enclosures), factors such as the ventilation, temperature and the amount of water available also greatly affects the humidity.

Comparatively more ventilation, larges spaces, less water and lower temperatures leads to lower relative humidities. The opposite is true for more ventilation, smaller spaces, more water and higher temperatures.

In the case of pet Bearded dragons we have most control over the ventilation and temperature.

What humidity are we talking about for keeping Bearded dragons?

Remember that the popular Inland Bearded dragon (P. vitticeps) originates from the drier and desert areas of South Australia. The outside humidity in these areas are on average about 50 – 60% – which is quite low compared to non-desert areas.

Why humidity is important for keeping Bearded dragons

Generally, too high humidities will lead to an increase in diseases. In this case, diseases such as intestinal parasites, skin and mouth infections, and pneumonia are more common.

When the humidity is too low the risk for dehydration, overheating and shedding problems increase.

How will I know what the humidity is like?

The humidity can be measured with a hygrometer. By looking around, small commercial hygrometers might be available from some pet shops and on the internet. Some Bearded dragon keepers are also handy enough to make their own hygrometer.

Exo-Terra hygrometer
Exo-Terra produces a very popular, small and cost effective reptile hygrometer.

A hygrometer can be placed directly in the space where you want to measure the humidity. It is always a good idea to take multiple readings, for example during the day and during the evening.

So how do we approach this?

First of all it is important to note that the humidity will vary from setup to setup, i.e. no two Bearded dragon enclosures will have exactly the same humidity.

Before changing anything, or before finalising the setup, test the humidity first. The general idea is to have an enclosure with a fairly low humidity. In the case of humidities lower than 50%, it can be increased by adding a bigger water dish, moving the water dish closer to the heat source, reducing the temperatures a bit or by closing some ventilation. In the case of humidities above 60%, the opposite can be done.

How will I know the humidity is incorrect?

The problem is that you might not know until it is too late. It must also be noted that even incorrect humidities might not necessarily lead to problems, ever, but for those that might show problems the problems can be severe and even lead to death.

Apart from unrecommended humidity measurements, keepers might also pick up something is wrong when a Bearded dragon spends too much time in the water dish or has shedding problems. Other Bearded dragons might try to escape by climbing the sides of the enclosure while others might show open-mouth breathing or poor appetites.


Even though often neglected, the relative humidity is not always a problem for pet Bearded dragons. Saying this, incorrect humidities can cause all sorts of serious problems –  so it is better to keep and eye on it. Most setups will suffice as is.

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About the author

Renier has a keen interest in the welfare of pet reptiles. He has been keeping and treating Leopard geckos for many years and has written various forms of literature on them and other fascinating reptiles.

Renier Delport is also the author of The Advanced Bearded Dragon Manual and other Bearded dragon related eBooks.