A Solar Vintage Defined by Balance

Vines, particularly on the Left Bank, came under considerable hydric stress and in some cases shut down entirely as was the case at Carmes Haut-Brion, limiting photosynthesis. Curiously, this proved rather beneficial. Sugar accumulation slowed, helping to keep alcohol levels in check. As Pierre-Olivier Clouet of Cheval Blanc noted, “the hydric stress in 2025 reduced the volumes but shaped the raw material. The balance is precise, the concentration remarkable.”

By mid-summer, comparisons with 2003 began to circulate. A key difference in 2025 was the August diurnal range. In 2003, the nighttime temperature stayed in the high 20s. In August 2025 the days hit well into the 30s yet the nights saw temperatures in the teens, maintaining acidity and slowing sugar accumulation.

The decisive moment came at the end of August. Rain arrived, much to everyone’s relief, accompanied by cooler nights. Thienpont was unequivocal: “without the rain we would have had another 2003. We used to be drowned by rain, now we are saved by it.”

 

The impact was immediate. Potential alcohol levels dropped, at Cheval Blanc from around 14.5% to 12.7%, tannins softened, ripening evened out, and acidity was preserved. In Saint-Estèphe, where cool nights were particularly pronounced with their higher exposure to the Gironde and closer proximity to the Atlantic, the effect was striking. Baptiste Belly of Château Cos d’Estournel noted there were “only two nights above 20°C in August” resulting in wines that are both “concentrated and floral,” with a “unique balance.”

The result is a solar vintage that avoids the usual excess. It lacks the sheer power of 2022 and the exuberance of 2018, instead offering something altogether more measured, more composed.

One of the surprises of the year is the performance of Merlot. In such warm conditions, Cabernet Sauvignon was widely expected to dominate. Instead, Merlot has excelled and many claimed it has adapted to the new climate, producing wines that are aromatic, dense, and remarkably poised. As Justine Courtier-Facque of Château Palmer succinctly put it, “it was a Merlot year.”