“Following the heatwave alert that began on July 25, 2025, an excess mortality was detected, with 264 additional deaths observed in mainland Portugal,” stated the Directorate-General of Health in a communiqué.
Estimates from the National Institute of Health Doutor Ricardo Jorge (INSA) indicate these numbers represent “a relative excess” of 21.2% above expected figures between July 26 and 30, 2025, particularly affecting those aged 75 or older and in the northern region of the country.
The Portuguese Institute of the Sea and Atmosphere (IPMA) forecasts a significant rise in temperatures across the mainland in the coming days, with values expected to reach or exceed 40°C in various regions of mainland Portugal, especially over the weekend.
The DGS warns that “the very high air temperatures, as seen in recent days (both maximum and minimum), have a known negative impact on health, resulting from dehydration or exacerbation of chronic diseases, among other factors, especially among the elderly.”
It highlights that high air temperatures are typically associated with periods of mortality higher than expected for this time of year (excess mortality).
As of today, the ÍCARO index for mainland Portugal — calculated by INSA to estimate the impact of air temperatures on mortality — predicts a very significant effect of temperature on mortality during the heatwave, particularly in the North, Center, and Alentejo regions.
In light of the current situation, the DGS, in coordination with the Executive Directorate of the SNS (DE-SNS) and local structures, has been coordinating the activation of contingency plans based on risk assessments conducted.
Simultaneously, the DGS has intensified communication with the public through various means and platforms in recent days, aiming to clarify and raise awareness about recommendations to adopt during periods of extreme temperatures.
“Despite all efforts to mitigate the impact of heat on health, a period of excess mortality is expected in the older age groups,” it emphasizes.
The health authority underscores the importance of the entire population, especially vulnerable groups – such as those with chronic illnesses, the elderly, children, pregnant women, outdoor workers, the homeless, or socially isolated individuals – adopting the DGS recommendations available on its website.
The DGS states that it will continuously monitor the situation, updating information as necessary.
