September 2025 brought a striking mix of extremes to Spain. While the month ended with intense storms that drenched the Mediterranean coast, it was, overall, one of the warmest Septembers in more than six decades — continuing the country’s pattern of record-breaking heat.
Record Temperatures Across the South
According to Spain’s State Meteorological Agency (AEMET), the average temperature across mainland Spain in September was 19.7°C, around 0.6°C higher than the 1991–2020 average. This makes it the 23rd warmest September since records began in 1961, and the tenth warmest of the 21st century.
The heat was far from evenly distributed. Western Galicia experienced slightly cooler than normal conditions, while nearby regions such as Asturias, Cantabria, the Basque Country, Castilla y León, and Extremadura saw near-average temperatures.
In contrast, southern and southeastern Spain baked in prolonged warmth. Andalucia, Castilla-La Mancha, the Valencian Community, and Murcia all recorded temperatures roughly 2°C above normal, with most of the rest of the country averaging about 1°C warmer than usual.
Sizzling Days, Chilly Nights
Some areas saw near-record heat. Gran Canaria airport reached 39.9°C on September 19, while Córdoba and Granada airports both topped 39°C earlier that week. Jerez de la Frontera followed closely with 39°C on September 12. Four major weather stations across Spain registered their highest September temperatures on record.
Yet the month wasn’t without sharp contrasts. Certain inland areas experienced unseasonably cold nights: Molina de Aragón dropped to -1.4°C on September 24, Puerto de Navacerrada hit -1.0°C on the 22nd, and Burgos Airport recorded -0.7°C on the 26th.
A Dry Month for Most — Until the Final Days
Rainfall was scarce across most of Spain. The national average for September was just 25.4 millimetres — barely 57% of the normal amount — making it the twelfth driest September on record, and the fourth driest so far this century.
Central and southwestern regions, including parts of Castilla-La Mancha, La Rioja, and Navarra, endured particularly dry conditions. Much of the country’s interior and northwest were also below average for precipitation.
Mediterranean Storms Break the Dry Spell
The picture changed dramatically in the final days of the month. Powerful storms lashed the Mediterranean coast, bringing torrential downpours to Catalonia, the Valencian Community, and the Balearic Islands.
On September 30, Ibiza airport recorded a staggering 101.1 mm of rain in a single day. Valencia followed with 96.8 mm on the 29th, Tortosa saw 72.8 mm on the 28th, and Alicante-Elche airport collected 69.3 mm the same day. Alcantarilla airbase in Murcia registered 60.6 mm on the 29th.
These late-September deluges, though intense, came after weeks of unusually dry weather. As a result, while early October’s storms may have seemed sudden, they were in fact the dramatic finale to one of Spain’s warmest and driest Septembers on record.
