Heat index to reach 'danger' 45°C in 3 areas on May 24, 2025

The heat index in three areas in Luzon is expected to reach as much as 45 degrees Celsius on Saturday, May 24, 2025, according to PAGASA.

The 45ºC heat index may be felt today in these three areas:

— Laoag City, Ilocos Norte
— Dagupan City, Pangasinan
— Aparri, Cagayan

PAGASA classifies as under "danger level" the heat index in the range of 42 to 51ºC. At this level, the public may likely experience heat cramps and heat exhaustion. Meanwhile, heat stroke is probable with continued exposure.

Fifteen other areas may also have heat index in the danger level on Saturday, May 24, data from PAGASA showed:

— Tuguegarao City, Cagayan - 44°C
— Cubi Pt., Subic Bay, Olongapo City - 44°C
— Sinait, Ilocos Sur - 43°C
— MMSU, Batac, Ilocos Norte - 43°C
— ISU Echague, Isabela - 43°C
— Baler (Radar), Aurora - 43°C
— Casiguran, Aurora - 43°C
— Infanta, Quezon - 43°C
— Iloilo City, Iloilo - 43°C
— Bacnotan, La Union - 42°C
— Calayan, Cagayan - 42°C
— Iba, Zambales - 42°C
— Hacienda Luisita, Tarlac City - 42°C
— San Jose, Occidental Mindoro - 42°C
— Masbate City, Masbate - 42°C

Meanwhile, 40°C heat index may be felt on Saturday, May 24 in these two areas in Metro Manila:

—NAIA, Pasay City - 40°C
—Science Garden, Quezon City - 40°C

PAGASA said heat index falling in the range of 33 to 41°C is under the "extreme caution" level. At this level, heat cramps and heat exhaustion are possible, and continuing activity could lead to heat stroke, the weather bureau said.

On Friday, Laoag City, Dagupan City and Aparri in Cagayan had heat index reaching 45°C, the weather bureau said.

The heat index is the measure of the temperature that a person feels in contrast to the actual air temperature.

On Saturday, the Intertropical Convergence Zone (ITCZ) will affect Visayas, Mindanao, and Palawan while the easterlies will affect the rest of Luzon, PAGASA said in its weather forecast.

Visayas, Mindanao, and Palawan will have cloudy skies with scattered rains and thunderstorms due to the ITCZ.

Metro Manila and the rest of Luzon will have partly cloudy to cloudy skies with isolated rain showers or thunderstorms due to the easterlies. —KG, GMA Integrated News