The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) observed "dangerous" heat indices in 13 areas on Friday, June 7.
The highest heat index of the day recorded by PAGASA was 45 degrees Celsius (°C) in Itbayat, Batanes, followed by 44°C in Maasin, Southern Leyte.
A heat index of 43°C was experienced in Aparri, Cagayan, and ISU Echague, Isabela.
Meanwhile, temperatures reached 42°C in Ninoy Aquino International Airport (NAIA) Pasay City, Metro Manila; Dagupan City, Pangasinan; Bacnotan, La Union; Tuguegarao City, Cagayan; Alabat, Quezon; Cuyo, Palawan; Virac (Synop), Catanduanes; Dumangas, Iloilo; and Catarman, Northern Samar.
PAGASA classifies a heat index within the danger level if it ranges from 42°C to 51°C.
This heat index classification indicates the likelihood of heat-related issues such as cramps and exhaustion and an increased risk of heat stroke with continued activity.
June 8 heat index forecast
Meanwhile, for June 8, PAGASA said that six areas may still experience heat indices that are considered "dangerous."
These areas are Dagupan City, Pangasinan; Aparri, Cagayan; Tuguegarao City, Cagayan; ISU Echague, Isabela; and Maasin, Southern Leyte.
PAGASA added that Bacnotan, La Union, may have a heat index of 42°C