Humidity is the silent factor behind many reptile health problems, from stuck sheds to respiratory infections. Get it wrong and even a perfectly heated enclosure can make your animal ill. Here's how to measure, adjust, and maintain the right humidity for your species.
Why Humidity Matters
Humidity affects shedding, hydration, and respiratory health. Too low and reptiles struggle to shed and can become dehydrated; too high (especially with poor ventilation) breeds bacteria and causes scale rot and respiratory infections. Each species evolved for a particular range; your job is to match it.
Know Your Species' Range
- Desert species (bearded dragons, leopard geckos): low, around 30–40%
- Temperate species (corn snakes, many colubrids): moderate, around 40–50%
- Tropical species (crested geckos, ball pythons, many frogs): high, around 60–80%
Always research your exact species; these are general bands, not rules.
Measure It Properly
You can't manage what you don't measure. Use a reliable digital hygrometer; cheap analogue dials are often wildly inaccurate. For larger or mixed enclosures, use more than one.
💡 Pro tip: A humid hide, a covered box with damp moss inside, lets a reptile access high humidity on demand for shedding, even in a drier enclosure. It solves most shedding problems instantly.
How to Raise Humidity
- Mist the enclosure (by hand or an automated mister)
- Use a moisture-retaining substrate (coir, sphagnum moss, bioactive soil)
- Add a larger water dish, or move it under the warm end to increase evaporation
- Partially cover a mesh top to retain moisture, but never block ventilation entirely
- Add live plants in bioactive setups
How to Lower Humidity
- Increase ventilation
- Switch to a drier substrate
- Use a smaller water dish, placed at the cool end
- Reduce or stop misting
Warning Signs to Watch For
- Too low: incomplete or patchy sheds, retained shed on toes and tail tips, sunken eyes
- Too high: wheezing or open-mouth breathing, bubbles around the mouth/nose, scale rot, persistent mould
Stuck shed around toes or the tail tip can cut off circulation; address humidity promptly if you see it.
Find hygrometers, foggers, substrates, and reptile supplies in our Reptile range.
