Xenopus laevis are very sensitive to changes in water temperature. Most people keep these frogs at a temperature between 69(F) and 72(F). Lethal temperature >86(F). I kept many Xenopus at room temperature for nearly 30 years without incident.

Water temperature has a profound effect on water quality. For example, dissolved oxygen levels decrease as water temperature increases. Un-ionized ammonia levels increase as water temperature increases.

Abrupt changes in temperature >8(F) are not tolerated and may result in heat shock.

I live in Nebraska and we are experiencing very hot and humid weather. So far my frogs are doing well. You may want add cooler water more often - lowering the temperature by 3-4 degrees each week until the temperature levels out at 72(F). Water chemistry is very important, so you may want to invest in a freshwater test kit. Good luck