The heat index could soar to a dangerous 60 degrees Celsius in early April.

The heat index combines air temperature with relative humidity, reflecting what the body feels rather than the actual temperature. 

A high heat index poses particular risk for vulnerable groups such as the elderly, children, pregnant women, people with chronic illnesses or obesity, and outdoor workers.

People are advised to take note of weather forecasts and heat index updates and avoid outdoor activities from 1pm to 4pm. They should drink around eight glasses of water during the day.

Alcohol and high-sugar drinks should be avoided during the heat. Lightweight, breathable clothing, hats and umbrellas are recommended when outside.

Those exercising or working outdoors should do so in groups and watch each other for signs of heat-related stress, officials said.