Eastern Spain has been hit by repeated rounds of torrential rain and thunderstorms since mid-September, with flash flooding returning across parts of Valencia and Catalonia as a succession of Mediterranean storm systems crosses the region.
The latest episodes have renewed concerns over saturated ground, rapidly rising water levels and further flooding in areas already affected by earlier storms.
Repeated flooding along the Mediterranean coast
The sequence began with a major thunderstorm outbreak on September 16 and 17.
Some of the most intense rainfall occurred in Valencia, where Torrent recorded 95.8 mm (3.77 in), including around 71 mm (2.80 in) in just 30 minutes. Chiva recorded 96.2 mm (3.79 in), while several other locations received more than 80 mm (3.1 in).
The intense storms caused widespread flooding and disruption. Valencia Airport temporarily suspended operations, forcing 12 flights to divert, while Metrovalencia services were disrupted. Schools and universities were also suspended in several affected areas.
Catalonia was also hit by exceptionally intense rainfall. Meteocat recorded more than 90 mm (3.5 in) locally in the Garraf and Vallès Occidental areas. Sant Pere de Ribes received 57.4 mm (2.26 in) in 30 minutes, while Canyelles accumulated 85.6 mm (3.37 in) in three hours.
One man died near Olivella after his vehicle was swept away by floodwater.
But the September 16–17 outbreak was only the beginning.
More storms return in late September
A new storm episode developed on September 28 and 29, bringing another round of heavy rain and thunderstorms to northeastern Spain.
Meteocat reported widespread rainfall across Catalonia, with more than 50 mm (2 in) recorded over broad areas. Torrential rain again caused flooding in Barcelona province, while emergency services responded to hundreds of incidents.
⛈️ Las tormentas provocan inundaciones en numerosas calles de poblaciones de Camp de Turiahttps://t.co/hL0zJCobbF pic.twitter.com/QSVyByWdRf
— Radio Valencia SER (@radiovalencia) September 16, 2026
In Gavà, a woman and her five-month-old baby had to be rescued after their vehicle became trapped in a normally dry stream channel.
Valencia and Castellón were also affected, with authorities reporting flooded roads and water entering homes and garages.
The repeated nature of the rainfall has become a major part of the story. Areas that have already received substantial precipitation have had little opportunity to recover before the next storm arrives.
Torrential rain continues into October
The unsettled pattern continued as October began.
AEMET warned of potentially torrential rainfall across parts of Valencia, Castellón and northern Alicante, with local rainfall rates potentially reaching 50 mm (2 in) in one hour. Some forecasts indicated 12-hour totals approaching 160 mm (6.3 in).
Catalonia also faced another period of intense rainfall, particularly across the Terres de l’Ebre. Meteocat warned that rainfall could exceed 40 mm (1.6 in) in 30 minutes and 90 mm (3.5 in) in three hours, with substantially higher totals possible during the wider episode.
Further flooding, road closures and emergency responses were reported as the rain moved through the region.
Imatges aèries de les inundacions a les Terres de l'Ebre recollides per l'helicòpter @salvamentogob.#bomberscat pic.twitter.com/S58l55mJjY
— Bombers (@bomberscat) October 2, 2026
A classic Mediterranean flood setup
The meteorological ingredients behind the repeated storms are familiar, but the combination can be particularly dangerous in autumn.
The Mediterranean remains warm after the summer, providing a plentiful source of moisture to the lower atmosphere. When an upper-level trough or pocket of colder air moves across Spain, instability increases sharply.
Moist air rising from the Mediterranean can then fuel deep thunderstorms. Where storms repeatedly develop over the same area, rainfall can accumulate at rates far faster than drainage systems can handle.
The geography of eastern Spain adds another ingredient. Moist maritime air is forced toward higher terrain, helping thunderstorms intensify and increasing rainfall efficiency.
Meteocat’s September analysis found that September 2026 was the warmest September recorded in Catalonia, while Mediterranean waters remained unusually warm. The agency linked several of the month’s intense rainfall episodes to the combination of warm conditions, abundant moisture and upper-level disturbances.
The result has been a succession of short-lived but highly efficient rainfall events, with flash flooding possible whenever thunderstorms repeatedly affect the same catchments.
With further instability possible across the western Mediterranean, eastern Spain remains vulnerable to another round of locally torrential rainfall and rapid flooding.
