The Portuguese Institute for Sea and Atmosphere (IPMA) forecasts high temperatures in mainland Portugal, with Lisbon reaching around 37 degrees and inland areas exceeding 40 degrees. Despite warnings of a heatwave, IPMA rejects exaggerated claims of temperatures reaching 50 degrees, emphasizing the need for accurate interpretation of meteorological data. Citizens are advised to take precautions against the heat while remaining skeptical of alarmist forecasts circulating online.