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MADRID — Sept. 30, 2025 — The summer heat that lingered over Spain until the last days of September has been knocked out by a sharp Atlantic front. Temperatures have fallen by as much as 10°C in less than a week, and the country is now dealing with heavy rain, strong winds and a far more fall-like feel. AEMET, Spain’s national weather service, has placed Catalonia under a red alert and Galicia under an orange alert.
AEMET’s warning scale runs from yellow to orange to red, and a red alert means the situation poses an extreme risk to people and property. The highest danger is in northern Tarragona, where forecasters expect intense rain to develop quickly. Other parts of Catalonia are under yellow or orange warnings, with rainfall rates that could easily cause road flooding and dangerous runoff.
The sudden turnaround is not just a passing shower. A deep Atlantic low-pressure system — a cyclonic front in meteorological terms — is pushing cold maritime air into the Iberian Peninsula. That cold air is displacing the warm mass that produced weeks of above-normal heat. When two very different air masses collide, the weather can become especially violent, which is why AEMET has been emphasizing the risk of hail, strong wind gusts and possible waterspouts along the Mediterranean coast.
Forecasters are most concerned about the speed of the rain. The newest AEMET bulletin says Catalonia could receive up to 180 liters per square meter in 12 hours, with part of that total falling in just 3 to 6 hours. In localized spots, rain may fall at rates of 60 liters per square meter per hour. For context, a single afternoon storm with that intensity can overwhelm urban drainage systems in cities like Barcelona and Tarragona.
The temperature drop has been just as noticeable. Overnight and early-morning lows in the north are now between 9°C and 13°C, roughly 48 to 55 degrees Fahrenheit. In the south, lows are near 15°C, about 59 degrees Fahrenheit. Afternoon highs across most of the mainland are struggling to reach 29°C, or 84 degrees Fahrenheit.
Galicia, on the northwest coast, is under an orange warning because of heavy rain and coastal storm conditions. The west and southwest of A Coruña could see up to 80 liters per square meter in 12 hours, while strong southerly winds make the Atlantic shoreline rough and dangerous.
AEMET says the front will not move through quickly. Rain is expected to cover much of the country through at least Oct. 1, with the heaviest downpours shifting from the Cantabrian coast toward the east. Afternoon hours will bring the most active weather. While the general flood risk is considered low at the moment, forecasters may issue new warnings as the system evolves.
One factor that makes this kind of rainfall more dangerous is dry ground. After a long, hot summer, the soil is compacted and less able to absorb a sudden pulse of water. That means even moderate rainfall totals can produce rapid runoff in hilly areas and river channels that were nearly empty just days ago.
This week’s alerts were already on the map before the first major storm cell formed. On Sept. 28, AEMET issued rain and storm warnings for Catalonia, Galicia, Andalusia, Aragon, Cantabria, Castile and León, Castile-La Mancha, Extremadura, Navarre and the Basque Country. That unusually broad list showed the front was not a localized event but a national-scale pattern change.
For Americans visiting Spain, the main takeaway is to pack layers, rain gear and flexible plans. Madrid and Barcelona will feel noticeably cooler than they did last week. The southern Mediterranean coast remains warmer, but showers can arrive quickly, especially in the afternoon and along the coast.
The Canary Islands are the clearest exception. Storm chances there are low through the weekend, though Saharan dust haze may linger. Travelers heading to the mainland should check AEMET’s warning map before driving in Catalonia or hiking in Galicia.
Beyond the official computer models, an old forecasting tradition is pointing in the same direction. The Cabañuelas, a folk method still followed in parts of rural Spain, suggests a rainy October. Jorge Rey, a self-taught forecaster who has gained attention for using the technique, expects the unsettled pattern to last through mid-month.
His outlook, which broadly aligns with the idea of repeated Atlantic fronts, includes:
Longer-range guidance is less detailed, but forecasters are watching one more pattern change near Oct. 23 or 24. A strong anticyclone is expected to weaken, which could allow a new front to bring rain and storms to northern and central Spain. The last days of the month may be calmer, although the Cantabrian coast could remain damp.
AEMET has not issued a formal outlook for the rest of October, but the general signal is clear: Spain is moving steadily toward winter. November will likely bring colder air and longer periods of rain.
The message for residents and visitors is simple: summer has ended. Spain’s delayed fall is now here, and the rain alerts should be taken seriously.
