The Philippines is experiencing a record-breaking heat wave, with temperatures soaring across the country.

Diplolo City recorded the highest heat index at 45º Celsius at 12 noon on Sunday, May 7.

On Mindoro island, San Jose was at 42º Celsius at 10 a.m. with relative humidity of 73%, while Calapan City recorded 41º Celsius at 2 p.m. with relative humidity of 78%.

The heat index is a measure of how hot it feels when relative humidity is factored in with the actual air temperature.

The heat wave has been ongoing for the past week, with Guiuan, Eastern Samar recording the highest computed heat index during the last seven days at 49º Celsius on April 16. San Jose ranked fifth at 47º Celsius on March 25.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration has issued warnings about the dangers of prolonged exposure to high temperatures.

People are advised to stay hydrated and avoid strenuous activities during the hottest hours of the day.