DOST-PAGASA launches iHEAT Map, predicts real-time PH heat index 

Reese Rabulan

With the summer season heating up, DOST-PAGASA releases iHEAT Map to provide Filipinos with accurate real-time weather forecasts and heat advisories nationwide to mitigate health risks amplified by climate change.

iHEAT Map, or the Interactive Heat Index Mapping and Prediction, is a user-friendly online platform embedded on the PAGASA website that is accessible from March 2026 to May 2026 on both PC and mobile. 

The color-coded interactive map displays the the actual temperature felt by a human body or heat index (HI) on a high resolution gridded map of the entire country. 

To gather the apparent temperature felt by a human in the PH’s summer heat, the platform utilizes air temperature and relative humidity. The platform uses data from the European Centre for Medium-Range Weather Forecasts (ECMWF) to create its heat index forecasts.

Users can utilize the platform by accessing the PAGASA website. Hover on the “Weather” tab and click on the “Heat Index” drop down option. The heat index of certain localities can be access by simply clicking a specific city on the map or typing the locality on the search bar. 

The interactive platform utilizes color coded heat index categories and implications to swiftly update Filipinos of the heat risks this dry season. 

The hottest heat index category is Extreme Danger (≥52°C) with a red color code and a potential imminent heat stroke with prolonged sun exposure. Followed by Danger (42-51°C) with a red-orange color code and a high possibility of heat stroke with extended activity. Yellow-orange for Extreme Caution (33-41°C), which can result in heat cramps and heat eexhaustion. Lastly, Yellow for Caution (27-32°C), with fatigue posing as a threat with continued exposure and activity.

“iHeatMap empowers Filipinos with real-time, science-based heat index data — so they can make informed, timely, and potentially life-saving decisions. It is a great example of how technology and science can work together for everyday public health and safety,” said DOST-PAGASA Administrator Nathaniel Servando.

To stay safe this summer, DOST-PAGASA promotes the public to stay hydrated, limit sun exposure, and use umbrellas, hats, and full-sleeve clothing during outdoor activities. Further recommendations can be found on the iHEAT Map platform.