Scorching temperatures are expected in 17 areas amid nationwide Labor Day celebrations and protests on Thursday, May 1.

The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), in its latest heat index bulletin, noted that 17 areas across the Philippines are expected to experience dangerously high heat index levels with heat indices ranging from 42°C to 45°C.

PAGASA said the following areas are under “danger” heat index (42°C – 45°C): Bacnotan, La Union – 42°C; Tuguegarao City, Cagayan – 42°C; ISU Echague, Isabela – 42°C; Hacienda Luisita, Tarlac City – 42°C; San Jose, Occidental Mindoro – 42°C; Cuyo, Palawan – 42°C; CBSUA-Pili, Camarines Sur – 42°C; Cubi Point, Subic Bay, Olongapo City – 43°C; San Ildefonso, Bulacan – 43°C; TAU Camiling, Tarlac – 43°C; Alabat, Quezon – 43°C; Masbate City, Masbate – 43°C; Dagupan City, Pangasinan – 44°C; NAIA, Pasay City – 44°C; Iba, Zambales – 44°C; Sangley Point, Cavite – 45°C; and Ambulong, Tanauan, Batangas – 45°C.

Other heat index classifications

PAGASA noted that many regions were under the “extreme caution” category (33°C – 41°C) and are expected to experience this level, where heat cramps and heat exhaustion are possible.

Those under the “caution” level (27°C – 32°C) may also experience milder discomfort, but prolonged exposure may still pose risks, especially for vulnerable groups.

Health advisory from PAGASA

The extreme heat coincides with the dry season in the Philippines and is a cause for concern for health authorities and local governments, particularly in highly urbanized and densely populated areas.

To avoid heatstroke and other heat-related illnesses, PAGASA urged the public to stay hydrated by drinking plenty of water throughout the day; avoid direct sunlight, especially from 10 a.m. to 4 p.m., the hottest hours of the day; refrain from strenuous outdoor activities, particularly in areas under the "danger" alert; and wear light clothing and seek shade or use umbrellas when outdoors.