The Office of Civil Defense (OCD) on Tuesday, March 4, urged nationwide vigilance to mitigate the health risks related to rising heat index in various parts of the country.

OCD Administrator Undersecretary Ariel Nepomuceno issued Memorandum No. 66 series of 2025 to emphasize the urgent need for heightened preparedness in response to rising temperatures linked to the weakening of the northeast monsoon (amihan).

To mitigate the risks of heat-related illnesses, the memorandum outlined several key preventive measures:

•Limit the time spent outdoors;

•Drink plenty of water;

•Avoid tea, coffee, soda, and liquor;

•Use umbrellas and wear hats and sleeved clothing outdoors;

•Schedule heavy-duty activities for the beginning or end of the day, when it's cooler.

“As we approach the warmer months, it is imperative to recognize the potential risks associated with high heat index levels. The high heat index poses significant health risks including heat exhaustion and heat stroke. It is our responsibility to ensure the safety and well-being of our communities through proactive measures,” Nepomuceno said.

According to the OCD, the shift to easterly winds is expected to result in warmer and more humid conditions, with peak heat anticipated from mid-March to the end of May.

It said the Department of Science and Technology – Philippine Atmospheric, Geophysical and Astronomical Services Administration (DOST-PAGASA) has been closely monitoring the heat index since early March and predicts further increases in the coming week. 

In response, the National Disaster Risk Reduction and Management Council (NDRRMC) recommended that all councils and agencies prepare by ensuring the availability of protective gear and adequate medical supplies for emergencies.

Further, Nepomuceno directed all OCD regional directors to collaborate with national and local agencies to closely monitor their areas of responsibility (AORs) and ensure that response and emergency vehicles are prepared for deployment. 

They were also directed to secure sufficient supply of medical items to address potential emergencies stemming from extreme heat.

The OCD administrator emphasized that it is crucial to take preventive measures against the dangers posed by prolonged exposure to high temperatures.

“We encourage everyone to assist the Department of Health (DOH) in spreading public awareness about preventing heat-related illnesses,” Nepomuceno said, stressing that key messages include the importance of hydrating with water instead of sugary or alcoholic drinks, minimizing sun exposure, and utilizing sun protection like hats and sunscreen.

According to PAGASA, there could be “danger-level” heat index as high as 46 degrees Celcius in Metro Manila until Tuesday.

The scorching temperatures prompted several local government units in Metro Manila and nearby provinces to suspend classes.