Heat wave returns to Spain with temperatures exceeding 40 degrees and storm warnings

Spain is experiencing the third heat wave of summer 2026, with temperatures reaching over 40 degrees Celsius in various regions, particularly affecting Catalonia and the Mediterranean coast. The Spanish Meteorological Agency (AEMET) has issued yellow alert warnings for multiple autonomous communities due to high temperatures and hot nights. The heat wave is expected to peak mid-week, with some areas potentially approaching 43 degrees. Meteorologists also warn of the possibility of severe thunderstorms and granizo (hail) accompanying the extreme heat in certain regions. The extreme weather represents a continuation of the challenging summer conditions affecting Spain, with forecasters noting the need for caution regarding potential infrastructure stress and public health impacts.