Barcelona is under a red alert for extreme heat, with temperatures expected to reach 35°C. Authorities warn of tropical nights and little relief. Rain is possible later in the week, but forecasts remain uncertain.
Barcelona is entering one of the most intense heat episodes of the summer, as the Servei Meteorològic de Catalunya (Meteocat) has issued a red alert for extreme temperatures across the region. On Wednesday, the city is forecast to see minimum temperatures of 25°C and highs up to 35°C, with the heatwave affecting not only the capital but also the interior, Vallès Oriental and Occidental, and surrounding areas. The alert comes after a brief period of milder weather, marking a sharp return to full summer conditions.
According to Meteocat, the third heatwave of July is expected to peak midweek, with tropical nights offering little respite. The sky over Barcelona will start the day partly cloudy due to high-altitude clouds moving from southeast to northeast, mainly impacting the coast, pre-coastal areas, and central Catalonia. By evening, low clouds are likely to form in the far north of the coastal strip, but significant rainfall is not expected for now.
The Agencia Estatal de Meteorología (AEMET) supports this outlook, indicating that on Wednesday, July 15, the likelihood of rain in Barcelona is minimal. Only isolated, weak showers with traces of dust may occur along the coast and pre-coastal zones. There is also a chance of dry thunderstorms, which could bring lightning but little or no precipitation. Despite the persistent heat, the forecast suggests only medium to low chances of rain for Wednesday and Thursday, leaving the region largely at the mercy of high temperatures.
Authorities have highlighted the risk associated with this heatwave, especially for vulnerable populations and those living in the hottest inland areas. The red and orange alerts issued by Meteocat signal a very high level of danger, urging residents to take precautions against heat-related health issues. The current episode is expected to be the most severe of the summer so far, with temperatures in some parts of Catalonia potentially exceeding 40°C. While a slight decrease in temperatures is possible in the coming days, the overall trend remains uncertain, and any relief from rain is not guaranteed.
This extreme weather in Spain echoes broader European patterns, where heatwaves have disrupted daily life and major events. For example, the Tour de France recently had to shorten stages and introduce special cooling measures for athletes, as detailed in this report on how cycling teams are coping with the heat. Such developments underline the growing impact of climate extremes across the continent.
Heatwaves have become increasingly common in Spain over the past decade, with 2026 already recording several episodes of record-breaking temperatures. The Spanish health authorities regularly advise residents to stay hydrated, avoid outdoor activities during peak heat, and check on elderly or vulnerable neighbors. In urban areas like Barcelona, the combination of high humidity and elevated night-time temperatures can exacerbate health risks, particularly for those without access to air conditioning. The ongoing situation highlights the importance of monitoring official weather updates and following public safety recommendations as conditions evolve.
