The suitable water temperature range for betta fish is generally between 24 - 28°C. Within this temperature range, betta fish can maintain their optimal growth and health conditions.

Suitable Temperatures for Different Kinds of Betta Fish
Chinese Betta Fish: The suitable water temperature is 25 - 28°C. If breeding is involved, the water temperature should be controlled between 26 - 27°C.
Siamese Fighting Fish (Thai Betta Fish): The suitable water temperature is 22 - 24°C, and it should not be lower than 20°C.
The Impact of Temperature on Betta Fish
A suitable water temperature helps betta fish maintain a healthy metabolism and growth state. Water temperatures that are too low or too high will affect the health of betta fish and may even lead to their death.