Hong Kong is experiencing the hottest Mid-Autumn Festival ever recorded, with the temperature at the observatory hitting 35.7 degrees on Tuesday.

It was also the hottest day of the year so far, with the mercury topping 37 degrees in some places, including Lau Fau Shan and Yuen Long Park.

There was also bad news for moon gazers, with the forecaster warning of clouds, showers and isolated thunderstorms.

Some people at Hong Kong Park told RTHK they prefer staying in when it's so hot.

"Because outside is too hot. I would just stay indoors to play video games. I would just drink some cold water or cold drinks or go swimming," said a primary school pupil.

Another student said he will watch the Tai Hang Fire Dragon Dance on TV because he has to catch up on some studies.

"I would just probably just have a dinner with my grandparents and just reunite with each other. I would probably stay indoors too because the weather is just so hot, [and] because I have to revise my dictation," he said.

But another primary school pupil said the heat wouldn't stop him from heading to the park to look at the moon.