According to a report from the Portuguese Institute of the Sea and the Atmosphere (IPMA), with information updated on 1 June, in terms of the average number of days in a heatwave, this episode is classified as the third longest, with 9.3 days, the longest having been in 1964 (9.7 days).

As for the average magnitude of the heatwave, which refers to the intensity and extent of the thermal deviation, this episode ranks second, with the highest occurring in 1965.

"Based on the most recent information, 10 automatic weather stations in the IPMA network, used to monitor this phenomenon, remain in a heatwave condition," it pointed out.

According to IPMA (Portuguese Institute of the Sea and the Atmosphere), the heatwave persisted in the northern and central interior regions and in Alentejo, with only the coastal regions not experiencing it.

During that period, 25 new maximum air temperatures were recorded: one on 26 May, three on 28 May, and the rest on 27 May. The stations in Trancoso and Macedo de Cavaleiros exceeded these limits for the second time this month.

A new absolute extreme was also recorded in Mora, reaching 40.3°C, and the stations in Mora (Évora district) and Alvega (Abrantes, Santarém district) surpassed the previous absolute extreme for May (40°C, Pinhão).