Prolonged European drought conditions and repeated heatwaves have driven the Rhine to record or near-record lows at key gauges like Kaub in summer 2026, severely restricting navigation depths and cargo loads. Persistent below-normal rainfall forecasts through early August have reinforced trader views that recovery to standard water levels will require sustained precipitation across the basin. With probabilities clustered tightly around 36-39% across September and October windows plus a similar share for no return by November, markets reflect high uncertainty over the timing and volume of autumn rainfall or snowpack accumulation. A series of significant wet-weather systems or revised hydrological outlooks could quickly shift consensus toward earlier normalization, while continued dry patterns would widen support for later or post-November resolution.