Spain is set to experience an intense heatwave as temperatures soar to 40 degrees Celsius in cities like Sevilla and Córdoba, prompting warnings from the State Meteorological Agency (AEMET). This unusual warm spell marks the potential onset of the first heatwave of the summer and could be one of the earliest on record. Many areas will see temperature increases of 5 to 8 degrees compared to earlier in the week, with alerts in several Andalusian provinces. The AEMET advises caution as the worst of the heat is expected between Sunday and Monday, especially in the Guadalquivir valley.