Gauging humidity for bearded dragons

Complete Guide to Humidity for Bearded Dragons

The best humidity for bearded dragons 30-40% (relative humidity). Providing the best humidity levels for a bearded dragon in their enclosure will support their health and well-being.

The Best Humidity Level for Bearded Dragons

What humidity do bearded dragons need? The great news is that bearded dragons don’t actually need a lot of humidity. The recommend the ideal humidity bearded dragons need is between 30-40%. (School of Veterinary Science UQ, 2015; Proceedings of the Australian Veterinary Association, 2011).

The recommended humidity level for bearded dragons is very broad and based on relative humidity. It is assumed that all species of bearded dragons, in all seasons, at any time of the day day or night and any season (summer or winter) require between 30-40% humidity.

Special note for bearded dragon keepers who live in Australia. Since only bearded dragons that naturally live in the state can be kept as pets, as you are keeping your bearded dragons in more natural conditions (especially outdoors), you should not have to adjust for humidity. If they are being kept in tanks or other poorly ventilated housing then humidity may be an issue.

For Queenslanders the Queensland Code of Practice for Captive Reptile and Amphibian Husbandry requires that keepers monitor the humidity in the enclosure regularly. This is a perfect practice for all reptile owners.

Humidity for bearded dragon
Humidity for bearded dragon

The Confounding Thing About How Temperature Affects How Much Humidity There Is!

So you thought you had the perfect humidity and then boom, it went right up in the night! #*$*?!? That is relative humidity!

Relative humidity is how much water vapor the air is holding at a given temperature and this is expressed as a percentage. The maximum level of humidity (100%) is saturation point. The hotter the air, the more water vapor it can hold. So the amount of water vapor in the air is relative to the temperature.

zehnderamerica explains absolute and relative humidity

At a relative humidity of 40% (ideal humidity level for a bearded dragon) means the air holds 40% of the maximum water vapor that it can at that temperature before it would become saturated.

Air with a temperature of 30°C can hold more than three times as much water vapour as air at 10°C.

Commonwealth of Australia, Bureau of Meteorology
Weather forecasts use relative humidity.
Weather forecasts use relative humidity.

This helps clear up why it seems that humidity goes up at night. The humidity of your bearded dragons tank may seem fine during the day, but at night it appears to increase. In fact, it is more likely that the temperature dropped.

Once the temperature dropped, as it should do at night, the air could not hold the same level of moisture that it did during the day which made the relative humidity higher. Turn the heat back up and the relative humidity reading will start to decrease again. So if the night time humidity for your bearded dragon housing sometimes seems to high but it was fine in the day, chances are the temperature dropped.

The warmer the air is, the higher its capacity to hold moisture. As temperature increases, the relative humidity decreases even though the water level remains the same. This relationship is important to understand in order to manage humidity.

Short video explaining relative humidity and includes dewpoint, from NWSChicago

How to Measure Humidity

To know how much humidity your bearded dragon tank has, install a hygrometer. A hygrometer measures the amount of humidity and water vapour in the atmosphere.

Choosing the Right Type of Hygrometer for You

Hygrometers are either analogue or digital. Both are suitable for your bearded dragons house.

Installing two hygrometers is best. This will help you to pick up on when one isn’t performing as well as it should and you can place them slightly apart to monitor a wider area. Some hygrometers are not reliable, particularly on the cheap range.

Analogue hygrometers
Pros – No battery
Cons – No probe so the hygrometer must be placed in position to be measured

Digital hygrometers
Pros – Probe can be placed where the humidity is to be measured from and the display can be placed where it is easy for you to read
Cons – Requires a battery and the cord needs to be tucked away

Buy both an analogue and digital hygrometer. Installing both gives a backup and a means to pick up quickly on any discrepancy in accuracy of readings.

Measuring humidity for bearded dragons using hygrometers
Humidity for bearded dragons can be measured by placing hygrometers in the cage.

Placement of Hygrometers

Hygrometers are best placed somewhat centrally. Unlike thermometers, there is a lot more flexibility in where they can be placed while still being effective however, there are some key things to understand.

In the section Understanding Relative Humidity above, we know that relative humidity is relative to the temperature. The temperature gradient you are providing in your bearded dragons housing has a range of around 20°C difference from one end to the other. Given that, where you place the hygrometer, cool end of the tank to the hot end, can make a huge difference to the humidity reading.

Assuming the housing heating and lighting has been set up correctly, just place the hygrometer or its probe centrally on the back wall.

Digital hygrometers may come with or without a probe. Hygrometers with a probe provide much more freedom of placement. The probe and digital display can be placed apart making it easy to put the display wherever you can access it best.

Measuring humidity levels for bearded dragon housing
Place the hygrometer probe centrally and the display can be moved to a convenient location for viewing.

Don’t place the hygrometers or their probes in live plant foliage (artificial plant foliage is fine). Avoid corners where air circulation might be limited or over a water dish. These areas will exaggerate the level of water vapor in the air giving a reading that is not accurately reflect the environment.

Avoid letting the probe dangle down in the housing. A curious bearded dragon could always eat it. Place probes against a wall or accessory.

Controlling Humidity Levels

We know that humidity is all about the level of water vapor in the air. So it makes sense that to control humidity, you need to be able to adjust the amount of water vapor in the air.

Water vapor is added to the air through evaporation and transpiration and removed by condensation or freezing. If the humidity levels are wrong, then look at where evaporation or transpiration is occuring.

Before delving into adjusting the bearded dragons habitat, check the room the bearded dragon is housed in. It might be that your climate is humid, in which case that is where the focus needs to be. If it isn’t the wider environment, then investigate the animals housing.

Ensure you do one thing at a time to resolve humidity level issues and monitor the hygrometer over the next few hours to check the results. This way if anything corrects the issue, you will be able to pinpoint what the solution was.

How Do I make my reptile tank less humid?

To lower humidity in your bearded dragon’s housing, simply reduce the water in the environment which in turn reduces evaporation and transpiration.

Just a note before going through how to get humidity down in your bearded dragons habitat, please read the section above on hygrometer placement if you haven’t already. Where your hygrometer is placed will change the reading you get.

Here are some quick and simple ways to lower the humidity for your bearded dragon:

  • Check the placement of your hygrometer. The location of the hygrometer makes a difference to the reading. The cool side of the housing will give a different reading to the hot.
  • Increase the ventilation. This is by far the easiest and quickest way to lower the humidity for your bearded dragon. Increasing ventilation in glass tanks is one of the reasons housing bearded dragons in glass tanks is problematic as it is difficult to add ventilation to a glass wall.
  • Put a hygrometer near the tank in the room it is placed in to check if the environment is causing the issue. If it is, can the ventilation in the room be increased or the tank be moved to a different room that has less humidity?
  • Reduce evaporation by moving any water sources away from heat. For example, move the water bowl to the cool end of the tank.
  • Reduce transpiration by moving any live plants to another room.
  • Place one or more socks of rice in the enclosure.
  • If the humidity is at extreme levels it is presumably exasperated by climate, use a dehumidifier in the room.

A note on fans. Fans move air, so if there is a cool pocket and a warm pocket of air then it will circulate those together combining to a more even temperature. Fans may help lower humidity for your bearded dragon housing if the humidity is due to trapped moisture (such as in tanks). Circulating and combining less moisture saturated air with a fan may help to reduce the humidity.

bearded dragon tank ventilation
Pet shop housing with ventilation.

High humidity levels present far more danger than low humidity. Some keepers report humidity level increasing at night and not so much through the day. Reading the section in this article Understanding relative humidity will help explain why this may be the case as temperatures will drop during the night.

Adding ventilation

If the housing is made of melamine or other materials easily modified, then you can simply add more ventilation. What this will do is allow more air to circulate which will level out the humidity closer to that of the room the habitat is kept in. You can buy a vent from any hardware store in many different sizes.

bearded dragon vents for enclosure
Vast range of vents from large to small, round to rectangular, available to install in housing.

Getting one that can be closed will be useful on days when you need to keep the heat in a bit more (such as winter).

wall vent lower humidity
Using a jigsaw to cut a hole, a wall vent can be installed to lower the humidity for the bearded dragon housing.

Glass tanks are not good for bearded dragons. It is very difficult to add air circulation which is the easiest way to lower high humidity levels. Glass tanks have the perfect qualities for fish but not so good for creatures that need good air circulation.

Manufacturers and pet shops love to sell tanks because they are easy to mass produce and so they can make the prices very attractive. This reduces the cost of entry for new reptile keepers, however it is unlikely to be the best option for the health of the bearded dragon or the wallet of the pet owner as health issues may escalate.

If you have purchased a glass tank (aka reptarium, vivarium) then repurposed it for breeding and/or maintaining your own insects or perhaps as a quarantine environment.

If you love creating things yourself, then check the section on DIY housing. Even if you are not much with the old carpentry tools, there are some ways you may be able to get around it and make the housing practical, beautiful and something you can be proud of.


If lowering the humidity down to the ideal humidity level has not been successful with the quick and easy options above, then a dehumidifier may help. The desiccant and refrigerant dehumidifiers are reasonable options.

Small dehumidifier may be used to lower humidity in bearded dragon enclosure
If the humidity is too high, a small portable dehumidifier may be useful for lowering humidity for bearded dragons.

The desiccant dehumidifiers range from small portable units which can easily be added to any environment, to large ones suitable for rooms.

The Eva Dry Dehumidifier is one of the dehumidifiers which can be added directly to the environment.
It works using a renewable silica gel that absorbs moisture. Somewhere between 3-8 weeks the gel goes to its full capacity point and needs to dry out so it can remain effective.

Anything that is added into the enclosure must also become part of the cleaning routine. Consider how you will disinfect the dehumidifier when cleaning.

decrease humidity in a bearded dragon tank dehumidifier
A small and quiet refrigerant dehumidifier can be used to decrease humidity levels in a bearded dragons tank if they are too high.

From there you can go into refrigerant dehumidifiers. The Comforday Compact Dehumidifier and is about the cheapest you are going to get at under $50 US.

The reservoir is very small, but it is cheap and shouldn’t really be doing that much work. If it is working too hard then the environment is really unlikely to be suitable to keep a bearded dragon.

How to Raise the humidity in your bearded dragon tank

To raise humidity in your bearded dragon tank simply add more moisture to the environment, increasing evaporation and transpiration.

Just a note before going through how to raise humidity for your bearded dragon, please read the section above on hygrometer placement if you haven’t already. Where your hygrometer is placed will change the reading you get.

Here are some quick and easy ways to increase the humidity for your bearded dragon:

  • Check the placement of your hygrometer. The location of the hygrometer makes a difference to the reading.
  • Add a water dish towards, or in, the hot end of the tank (be mindful of hygiene, replacing water daily and water levels to prevent drowning).
  • Mist branches, or soak them, and place them near the heat lamp (be wary of placement and possible hazards such as fire). This will only last for hours.
  • Add plants, especially broad leaf plants. These will help bring moisture into the environment (ensure the plants are suitable for the bearded dragon).
  • Add a fogger with a timer to come on at set intervals during the day.

Keep in mind that the room the enclosure is in is likely to directly affect the microenvironment. It might be that adjusting the room will resolve issues in humidity in the enclosure. Measure both the room and enclosure with a hygrometer to identify which one needs adjusting to resolve any humidity issues quickly.

Low humidity levels are relatively easy to increase. Simply misting the bearded dragons in their enclosure daily and ensuring they are hydrated (fluids by mouth) may be sufficient to compensate for low humidity. If you need help to get your bearded dragon to drink, see the article on teaching your bearded dragon to drink for more ideas.

Health Issues Caused by incorrect Humidity Levels

Is Too much humidity is bad for bearded dragons?

Too much humidity is bad for bearded dragons. High humidity presents danger of harmful bacteria and fungus thriving and reaching levels that exceed the resistance of the immune system. Exacerbated by small environments with waste such as faeces, uneaten food or other waste material the concentration levels of excessive pathogens can rise quickly. Health issues can include:

  • Bacterial infections [6]
  • Ulcerative or Necrotic Dermatitis [7]
  • Mycotic disease [7]
  • Respiratory diseases [8]

Is Low humidity bad for bearded dragons?

Low humidity is bad for bearded dragons, although easier to remedy through alternative means. The greatest immediate health concern for low humidity for bearded dragons is dehydration. << link to post on how to get a bearded dragon to drink

Serious dehydration is not the only threat. Constant mild dehydration can cause deadly health issues. Health problems which may be contributed to by low humidity are also ones that are attributable to dehydration and include:

  • Avascular necrosis (juvenile Bearded Dragons are more susceptible)[1]
  • Dysecdysis (difficulty in shedding)[1, 3]
  • Renal disease [2, 5]
  • Non-obstructive Dystocia (eggs cannot be passed)[4]
  • Urinary tract disease [5]

How much Humidity do Bearded Dragons Get in the Wild?

The humidity bearded dragons get in the wild ranges from environment and season. However, bearded dragons such as the Pogona vitticeps (most commonly kept in captivity) generally range in areas of an average relative humidity between 30 and 50%.

The range of natural environments bearded dragons can live in is huge. The geographical distribution of each of the Pogona species varies. Along with that variation of territory, comes a range of different climatic conditions.

distribution of the wild bearded dragons Pogona
The map shows the distribution of Pogona minor minor (purple), Pogona microlepidota (tan), Pogona barbata (yellow) and Pogona vitticeps (green). Data from Atlas of Living Australia.

The map below shows the distribution of the Pogona vitticeps, Pogona barbata, Pogona henrylawsoni, Pogona minor and Pogona nullarbor. The distribution data is from the Australian Reptile Online Database (AROD) overlaid on a map from the Australian Government Bureau of Meteorology displaying the relative humidity ranges at 9am over a 30 year period (1961-1990).

Average daily relative humidity in Australia with distribution of bearded dragons
The average daily relative humidity in Australia overlaid with distribution of bearded dragons (Pogona) species showing the range of humidity conditions each species experiences.

On the map you can see quite a range in humidity levels for bearded dragons. This is great for a general idea but of course in reality, relative humidity goes up and down with temperature. So from one hour to the next, one season to another, the humidity fluctuates.

In the map below, the annual average at 9am and at 3pm are shown without the bearded dragon distribution overlay. This shows the humidity from one time in the day to another can range quite significantly. In the mornings, the relative humidity is higher than in the afternoons.

Relative Humidity ranges in Australia for Annual Averages
Annual average relative humidity ranges in Australia over a period of 30 years (1961-1990) at 9am and 3pm from the Australian Government Bureau of Meteorology.

The following map shows the average annual humidity over a 30 year period for Summer in the month of January and a winter month of July at 9am. For the Pogona vitticeps (see distribution on the map at beginning of this section), 20-50% would cover most of their range.

Relative Humidity ranges in Australia for Annual Averages for Summer and Winter months
Annual average relative humidity ranges in Australia over a period of 30 years (1961-1990) for a Summer month (January) and Winter month (July) at 9am from the Australian Government Bureau of Meteorology.

Further Reading and References

  1. Bearded Dragons – Problems by Rick Axelson, DVM. Care & Wellness, Medical Conditions, Nutrition, Zoonosis and Human Health
  2. Acute and Chronic Renal Disease: Diagnosis, Treatment, and Prognosis in Lizards Drs. Foster & Smith Educational Staff adapted from the information presented at the Western Veterinary Conference, 2003
  3. The School of Veterinary Science UQ (2015) How to Care for Your Bearded Dragon. VETS Small Animal Hospital (part of the University of Queensland, Australian)
  4. Preovulatory stasis and dystocia in oviparous lizards. Raffaele Melidone, Dr. med. vet.; Joyce S. Knoll, VMD, PhD, DACVP; and Nicola Parry, BSc, MSc, BVSc, DACVP. Veterinary Medicine. November 2008, 595-598
  5. Reptile and Amphibian Urinary Tract Medicine: Diagnosis and Therapy. Paul M.  Gibbons, DVM, MS, Dipl ABVP (Avian Practice), Animal Emergency Center, Glendale, WI 53066 USA
  6. Hôpital Vétérinaire Chambly
  7. Mycotic Diseases of Reptiles by Stephen J. Divers, BVetMed, DZooMed, DACZM, DECZM (herpetology), FRCVS, Professor of Zoological Medicine, Department of Small Animal Medicine and Surgery, College of Veterinary Medicine, University of Georgia
  8. Respiratory Conditions in Reptiles by Sean McCormack BSc (Hons), MVB, MRCVS. 30 December 2015
  9. Captive Reptile and Amphibian Husbandry. Code of Practice. Wildlife management. Nature Conservation Act 1992. Department of Environment and Heritage Protection
  10. Atlas of Living Australia.
  11. Proceedings of the Australian Veterinary Association (Sep, 2011) Handling and Nursing Reptiles. New South Wales Division Conference, Tamworth

Distribution data Australian Reptile Online Database
Australian Government Bureau of Meteorology
What is humidity? How is it measured? Math and Science Activity Center

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