Portugal is under a nationwide high-risk warning for ultraviolet (UV) radiation exposure today. The Portuguese Institute for Sea and Atmosphere (IPMA) reports that all districts in mainland Portugal, as well as the Madeira and Azores archipelagos, are affected. This indicates a significant potential for sunburn and other harmful effects from sun exposure. Residents and visitors are advised to take precautions, including seeking shade during peak hours, wearing protective clothing, and using sunscreen with a high protection factor. The alert covers the entirety of the country, encompassing both island regions and the continental territory. No specific duration for the high-risk period was given in the IPMA statement. Authorities recommend minimizing direct sun exposure to mitigate health risks.