Hot, humid conditions linger but with chances of rain showers, thunderstorms -- PAGASA
Metro Manila and the rest of the country will still be partly cloudy to cloudy with isolated rain showers or thunderstorms in the afternoon or evening, said the Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA).
In its weather bulletin issued on Monday afternoon, May 24, PAGASA said the warm easterly winds coming from the Pacific Ocean may continue to bring hot and humid weather conditions across the country, especially from noon to early afternoon.
Thirteen stations have recorded "dangerous" heat index values on Monday, based on the PAGASA's monitoring.
These include:
Dagupan City, Pangasinan (45°C, 2 p.m.)
Aparri, Cagayan (44°C, 2 p.m.)
Sangley Point, Cavite (44°C, 11 a.m.)
Davao City, Davao del Sur (43°C, 12 p.m.)
Itbayat, Batanes (43°C, 11 a.m.)
Legazpi City, Albay (43°C, 11 a.m.)
Masbate City, Masbate (43°C, 12 p.m.)
Catbalogan, Western Samar (41°C, 11 a.m.)
El Salvador City, Misamis Oriental (41°C, 2 p.m.)
Iba, Zambales (41°C, 2 p.m.)
Laoag City, Ilocos Norte (41°C, 11 a.m.)
Mactan International Airport, Cebu (41°C, 1 p.m.)
Tuguegarao City, Cagayan (41°C, 2 p.m.)
A heat index above 40℃ is considered "dangerous" due to the high likelihood of heat cramps and heat exhaustion.
So far, the highest heat index in 2021 was registered in Dagupan City, Pangasinan at 53℃ on May 14.

PAGASA said that while warm and humid conditions are expected to prevail in the next few days, isolated rain showers due to localized thunderstorms may also affect some parts of the country.
The occurrence of thunderstorms mostly in the afternoon or evening is becoming more frequent as the country approaches the climate transition period from warm and dry season to wet season.
Severe thunderstorms are often associated with bursts of heavy rainfall, lightning, thunder, gusty winds, and sometimes hail.
PAGASA is expecting the "normal" onset of the rainy season for areas under Type I climate between the second half of May and the first half of June.
Areas under Type I climate classification have two pronounced seasons--dry from November to April and wet during the rest of the year.
In 2020, PAGASA declared the onset of the rainy season in the country on June 12.