With temperatures soaring to highs of 42 Celsius, keepers at Dusit Zoo have been working to prevent animals becoming distressed, hosing down elephants and feeding chimpanzees sweet, cold treats made from fruits and syrup.
"These animals can be stressed out (if the weather is too hot)," said zookeeper Sompong Sawatnam.
"They will walk around shaking their heads. Each day, we have different kinds of popsicles made by nutritionists, which will help cool them down."
The zoo has also set up sprinklers and increased the amount of shade available for animals, while Thailand's Public Health Ministry has warned people to keep hydrated and remain inside to avoid heat stroke.