Water temperature is one of the most crucial factors for an axolotl’s health and longevity. A difference of just a few degrees can cause stress, loss of appetite or the onset of illness. Although axolotls are hardy animals, they remain very sensitive to temperature fluctuations. Here’s everything you need to know to maintain the ideal temperature in your aquarium.

The Ideal Temperature for an Adult Axolotl

Axolotls are cold-water animals. In captivity, the ideal temperature range is 15 °C to 18 °C. This corresponds to their natural habitat in Mexico’s high-altitude lakes. It supports healthy metabolism, reduces disease risks and encourages good appetite.

They can tolerate slightly lower temperatures (down to 10–12 °C) for short periods without danger. However, temperatures above 20 °C gradually become problematic.

Risks Linked to Water That Is Too Warm

From 20 °C onwards, the axolotl enters a stress zone. Its metabolism speeds up, which can lead to:

• Loss of appetite or, conversely, excessive agitation
• Weakening of the immune system
• Increased risk of bacterial or fungal infections
• Internal damage if the temperature rises too quickly

From 24 °C, the situation becomes critical. Prolonged exposure can cause irreversible injury or even death.

What if the Water Is Too Cold?

Unlike many tropical fish, axolotls tolerate cold water very well. Below 14 °C, their metabolism naturally slows. They eat less and move less, but without danger as long as the temperature does not drop below 5–6 °C for extended periods. Heating the water is generally unnecessary except in extreme or unstable conditions.

How to Maintain the Right Temperature

Keeping a stable temperature can be challenging, especially in summer. Here are some practical tips:

• Place the aquarium in a cool room away from sunlight
• Use a fan or an aquarium chiller to lower the temperature a few degrees
• Leave the lid open if evaporation is not an issue, allowing heat to escape
• Avoid strong lighting or filters that heat the water
• Use ice packs or sealed bags of ice in emergencies — sparingly and temporarily

Aquarium chillers remain the most reliable solution for people living in hot climates.

Should You Use a Thermometer?

Yes — absolutely. A reliable aquarium thermometer is essential. It allows real-time temperature monitoring and quick intervention if needed. Choose a digital model or a probe thermometer for better accuracy. Place it halfway up the tank where the axolotl spends most of its time.

How Temperature Variations Affect Behaviour

An axolotl placed in water that is too warm may:

• Swim to the surface frequently
• Show curled or shrunken gills
• Display rapid or irregular breathing
• Become unusually agitated or, on the contrary, lethargic

These signs should be taken seriously, as they indicate thermal distress. Cooling the water gradually is essential.

Conclusion

The ideal water temperature for an axolotl is between 15 °C and 18 °C. Within this range, the animal is active, less stressed and supported by a stronger immune system. Excessive heat is far more dangerous than cold. With proper equipment, regular monitoring and a good understanding of its needs, you can provide your axolotl with a safe and comfortable environment.