The measured heat index in eight locations remained in the "danger" category on Thursday, April 27, making it another hot and humid day for Filipinos across the nation.

Based on the monitoring of the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA), the areas with the highest heat indices observed on Thursday were Dipolog, Zamboanga del Norte (44 degrees Celsius); Guiuan, Eastern Samar (44℃); Roxas City, Capiz (43℃); Zamboanga City, Zamboanga del Sur (43℃); Butuan City, Agusan del Norte (42℃); Dagupan City, Pangasinan (42℃); Masbate City, Masbate (42℃); and Puerto Princesa City, Palawan (42℃).

PAGASA defines the heat index as the measurement of how hot it feels when relative humidity is factored in with the actual air temperature.

It said heat indices between 42°C and 51°C carry impending “danger” as “heat cramps and heat exhaustion are likely” and “heat stroke is probable with continued activity.”

(Graphics by PAGASA)

Meanwhile, PAGASA's three monitoring stations in Metro Manila, the Ninoy Aquino International Airport in Pasay City, Science Garden in Quezon City, and Port Area in Manila, recorded heat indices of 41°C, 38°C, and 38℃, respectively.

PAGASA said observe “extreme caution” when heat indices reach 32°C to 41°C, as “heat cramps and heat exhaustion are possible” and “continuing activity can result in heatstroke.”

Based on PAGASA’s data, the highest heat index recorded since March 1, 2023, was 49℃ in Guiuan, Eastern Samar on April 16.

In the next 24 hours, PAGASA said the entire country will continue to experience partly cloudy to cloudy weather with isolated rain showers or thunderstorms, mostly in the afternoon or evening.