Temperatures have been rising since Friday, April 17, and are expected to remain high until Tuesday, April 21, with highs reaching 30 degrees in several regions. The Portuguese Institute for Sea and Atmosphere (IPMA) has issued a warning for very high UV radiation levels across the country. Health authorities recommend avoiding direct sun exposure between 11 am and 5 pm, using sunscreen with an SPF of at least 30, and wearing protective clothing. Meanwhile, experts warn that buildings in Portugal are not designed to withstand such thermal extremes.