The Philippine Atmospheric, Geophysical, and Astronomical Services Administration (PAGASA) forecasts a "dangerous" heat index, ranging from 42°C to 51°C, in 37 areas nationwide on Wednesday, May 21, 2025.
Dagupan City, Pangasinan, and Aparri, Cagayan are expected to experience the highest heat index readings of 46°C.
However, Dagupan City recorded a heat index of 48°C on Tuesday, May 20, 2025.
Areas under the dangerous category have a risk of heat exhaustion and heat cramps, with continued exposure potentially leading to heatstroke.
Other locations like Laoag City and Tuguegarao City are anticipated to have a heat index of 45°C.
Several areas, including Sinait in Ilocos Sur and Iloilo City, are projected to reach 44°C.
Bacnotan in La Union and Cubi Point in Subic Bay are forecast to experience a heat index of 43°C.
A heat index of 42°C is predicted for numerous cities and provinces, including Butuan City in Agusan del Norte.
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