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Here's what heat index means; how to stay safe
Manila Bulletin
|March 25, 2026
With the end of the northeast monsoon season (amihan) on March 23, the Philippines is entering its warm and dry season, when rising temperatures and humidity make the heat more intense.
The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) monitors how this heat is actually experienced by the body using the heat index (damang init).
"The heat actually felt by the human body (apparent temperature) cannot be accurately measured by air temperature alone. It is more accurately 8 estimated by including data on heat and humidity (relative humidity),” PAGASA said.
The heat index combines air temperature with relative humidity to estimate the apparent temperature felt by the human body.
How heat index affects the body
PAGASA classifies the heat index into levels of risk to indicate how the body may be affected under various temperature and humidity conditions:
This story is from the March 25, 2026 edition of Manila Bulletin.
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