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Prepare for hotter days and nights ahead, surpassing the already scorching heat as temperatures could reach over 40 degrees Celsius in the coming weeks.

The temperature reached 40 degrees Celsius in Isabela on Monday, the hottest in the country so far this year, according to the Philippine Atmospheric, Geophysical and Astronomical Services Administration.

Dagupan City in Pangasinan may experience a heat index as high as 46°C.

At least 13 areas in the Philippines could experience a “danger” heat index of 44 degrees Celsius today amid the continued effects of El Niño and the dry season, according to the state weather bureau.

The weather agency's latest heat index bulletin said the 13 areas will be under the “danger” classification, with temperatures ranging from 42°C to 45°C.