Portugal is under alert for very high ultraviolet (UV) radiation levels expected to persist until Monday, according to the Portuguese Institute for Sea and Atmosphere (IPMA). The warning accompanies a heatwave forecast to bring maximum temperatures between 30 and 40 degrees Celsius. The regions of Alentejo, Ribatejo, and Douro are anticipated to experience the highest temperatures. Authorities advise citizens to take precautions against sun exposure during this period. These precautions include seeking shade, wearing protective clothing, and using sunscreen. The elevated UV index poses a risk of sunburn and other health issues. Residents and visitors are urged to stay hydrated and monitor weather updates.