South Korea registered its highest temperature since records began more than a century ago on Sunday, as authorities warned people to ¡°immediately¡± stop all outdoor activities in affected areas.

The southeastern city of Yangsan saw the temperature reach 42.5C at 1:26 p.m., the Korea Meteorological Administration said on its website.

Yangsan has been the epicenter of the ongoing heat wave, where temperatures exceeded 40 C for a fifth consecutive day on Sunday, while many other cities including Daegu and Busan are seeing temperatures climb into the high 30s.