‘Danger level’ heat index forecast for 27 areas on Monday, May 19, 2025

Twenty-seven areas are forecast to reach a ''danger level'' heat index on Monday, May 19, PAGASA said Sunday.

Based on the state weather bureau’s 5 p.m. May 18 bulletin, the synoptic stations in the following areas will measure a 42°C-45°C heat index:

45°C

• Dagupan City, Pangasinan
• Aparri Cagayan

44°C

• Laoag City, Ilocos Norte
• Tuguegarao City, Cagayan
• ISU Echague, Isabela
• Sangley Point, Cavite City
• CBSUA-Pili, Camarines Cur

43°C

• MMSU, Batac, Ilocos Norte
• Baler (Radar), Aurora
• Cubi Pt., Subic Bay, Olongapo City
• TAU Camiling, Tarlac
• Ambulong, Tanauan, Batangas
• Infanta, Quezon
• Cuyo, Palawan

42°C

• NAIA Pasay
• Science Garden Quezon City
• Sinait, Ilocos Sur
• Bacnotan, La Union
• Casiguran, Aurora
• Iba, Zambales
• San Ildelfonso, Bulacan
• San Jose, Occidental Mindor
• Daet, Camarines Norte
• Legazpi City, Albay
• Iloilo City
• Dumangas, Ililo
• Catarman, Northern Samar

The heat index is the measure of the temperature that a person feels in contrast to the actual air temperature. Computed by factoring in the humidity as well as the air temperature, the heat index measures "human discomfort" and is the "apparent temperature" felt by the human body.

PAGASA's heat index classification defines heat index temperatures ranging from 42°C to 51°C as being in the "danger" level, where "heat cramps and heat exhaustion are likely; heat stroke is probable with continued exposure."

PAGASA has asked the public to limit outdoor activity, remain hydrated, and wear fresh clothes to avoid heat-related illnesses. — Mariel Celine Serquiña/BM, GMA Integrated News