Manila: A huge part of the country will likely continue experiencing high heat index levels, possibly until mid-June, despite the rainy season, the weather bureau's head said on Tuesday. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) declared the start of the southwest monsoon (habagat) last May 30.

According to Philippines News Agency, occasional to frequent rains and thunderstorms are expected, PAGASA said in an advisory, adding the possibility of the onset of the rainy season in the coming days. In an interview with the agency, PAGASA Administrator Nathaniel Servando emphasized the significance of understanding that high heat index levels, or what the temperature feels like to the human body when relative humidity is combined with the air temperature, are still possible even during the rainy season.

He cited examples of Daet, Camarines Norte, and Virac in Catanduanes, noting that "coastal areas have very humid air, and the temperatures are high, so they experience high index levels." Servando also mentioned that residents in low-lying areas are likely to face hot and humid conditions. However, due to the habagat season, heat index levels in these areas might be lower.

Prior to the onset of habagat, PAGASA recorded a heat index level as high as 51°C. "We usually stop the issuance of observed highest heat index during the rainy season because the overall heat index values decline in a huge part of the country," Servando said. He noted that danger level heat indices (42°C-51°C) are still possible during the habagat season, although fewer areas are likely to experience it.

Meanwhile, Servando advised the public to bring an umbrella, drink water frequently, and wear comfortable clothes to cope with the heat. "Avoid long exposure to sunlight, especially during noon and afternoon," he added. The public is also urged to monitor updates from PAGASA.