'Danger' level heat index in at least 11 places on Nov. 1, 2026

The heat index in at least 11 places nationwide reached the "danger" level on Sunday, November 1, as families flocked to the cemeteries to visit departed loved ones.

According to PAGASA's computed heat index forecast, the automated weather stations in the following places recorded a heat index of at least 42 degrees Celsius on Sunday:

• Ilocos Region (Region 1)
  • Bacnotan, La Union: 42°C
• MIMAROPA (Region 4-B)
  • Coron, Palawan: 44°C
  • San Jose, Occidental Mindoro: 42°C
  • Cuyo, Palawan: 42°C
• Bicol Region (Region 5)
  • Legazpi City, Albay: 42°C
• Negros Island Region
  • Siquijor, Siquijor: 42°C
• Eastern Visayas (Region 8)
  • Catarman, Northern Samar: 43°C
  • Borongan, Eastern Samar: 42°C
  • Maasin, Southern Leyte: 42°C
• Zamboanga Peninsula (Region 9)
  • Dipolog, Zamboanga del Norte: 43°C
• CARAGA (Region 13)
  • Hinatuan, Surigao del Sur: 42°C

The heat index is the measure of the temperature that a person feels in contrast to the actual air temperature.

Essentially, it measures "human discomfort" and is the "apparent temperature" felt by the human body. It is computed by factoring in the humidity as well as the air temperature.

EXPLAINER: How hot is too hot? Understanding the heat index

PAGASA classifies a heat index of 42°C as being in the "danger" level, warning that heat cramps and heat exhaustion "are likely," and that heat stroke "is probable with continued exposure."

Authorities recommend the following precautions during hot weather:

• Drink plenty of water
• Avoid prolonged exposure to direct sunlight, especially at midday
• Wear light clothing and use hats or umbrellas
• Stay in shaded, well-ventilated areas
• Learn basic first aid for heat-related emergencies

The apparent temperature may also vary for each person because everyone has a different height and weight: a thin person walking outdoors on a sunny day in light clothing will feel less discomfort than the heavier pedestrian wearing bulky clothing next to him.

According to PAGASA, full exposure to sunshine can raise the heat index by as much as 9°C. Higher levels of humidity also drive up the heat index and make it more difficult for people to cool off. — BM, GMA News

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