Spain's Aemet weather agency issued red and orange alerts across several regions, warning of temperatures exceeding 39 to 40 C across large parts of the Iberian Peninsula and Mallorca, EuroNews reported.
The heatwave began Sunday and has already shattered multiple records, including the highest temperature ever recorded in the northern region of Cantabria at 43.7C (110.7F).
Record-high overnight temperatures were also registered in the city of Zamora and the province of Almeria.
The agency reported on Wednesday that this Monday and Tuesday (June 22 and 23) were the two hottest June days since at least 1950 in mainland Spain.
The weather agency warned international visitors: "Extreme danger. Exercise extreme caution!"
