28 areas under 'danger' heat index on May 11 — PAGASA

Twenty-eight areas across the country are forecast to experience “danger” level heat index values on Monday, May 11, 2026, according to the state weather bureau PAGASA.

Based on PAGASA’s five-day heat index forecast, the following areas may record heat index levels ranging from 44°C to 42°C:

44°C

• Dagupan City, Pangasinan
• Aparri, Cagayan
• Casiguran, Aurora
• San Jose, Occidental Mindoro
• Cuyo, Palawan
• Dumangas, Iloilo

43°C

• Laoag City, Ilocos Norte
• MMSU, Batac, Ilocos Norte
• Bacnotan, La Union
• Tuguegarao City, Cagayan
• ISU Echague, Isabela
• Baler (Radar), Aurora
• Iba, Zambales
• Puerto Princesa City, Palawan
• Aborlan, Palawan
• Daet, Camarines Norte
• Masbate City, Masbate
• Roxas City, Capiz
• Borongan, Eastern Samar

42°C

• NAIA, Pasay City, Metro Manila
• Sinait, Ilocos Sur
• CLSU Muñoz, Nueva Ecija
• San Ildefonso, Bulacan
• Sangley Point, Cavite City
• Infanta, Quezon
• Mulanay, Quezon
• CBSUA-Pili, Camarines Sur
• Iloilo City, Iloilo

PAGASA classifies heat index values between 42°C and 51°C under the “danger” category, warning that heat cramps and heat exhaustion are likely, while heat stroke is probable with continued exposure.

Meanwhile, more than 40 areas are expected to experience “extreme caution” heat index levels ranging from 33°C to 41°C.

Baguio City in Benguet is the lone area forecast to experience a “caution” level heat index at 27°C.

The following areas are expected to record “not hazardous” heat index levels, or below 27°C:

• BSU, La Trinidad, Benguet – 26°C
• Benguet Radar, Tuba, Benguet – 22°C

The heat index refers to the temperature felt by the human body when relative humidity is combined with actual air temperature. High humidity slows the evaporation of sweat, making it more difficult for the body to cool down.—MCG, GMA News