On 9 August 2026, the average daily discharge of the Rhine at Basel-Kleinhüningen was 416 m³/s, which is lower than 1 % of all daily averages recorded since 2020. The daily minimum reached 364 m³/s and the maximum 467 m³/s. These values are exceptionally low for the time of year: the maximum flow ranked 31st over the last 30 days, the absolute lowest among all August days since 2020, and also the lowest among all days in the entire dataset since 2020.

Over the past 30 days, discharge peaked at 710 m³/s on 19 July 2026 and fell to its lowest point of 319 m³/s on 8 August 2026. Table 2 lists the months with the lowest flow conditions since 2020, and August 2026 now tops that list with a minimum average flow of 416 m³/s, surpassing the previous low of 436 m³/s set in August 2022.

Low water levels on the Rhine have consequences that reach well beyond the river itself. Cargo vessels have to reduce their load to stay clear of the riverbed, so more trips are needed to move the same volume and transport costs rise sharply, with the effect passed on to industries that depend on the waterway for coal, oil products, chemicals and grain. The shallower water also heats up faster in summer. Warmer water encourages bacterial growth, which can produce noticeable odors, and it holds less dissolved oxygen. The combination of higher temperatures, lower oxygen and more concentrated pollutants degrades water quality and can lead to fish kills. Swimming is generally discouraged under these conditions because of the higher bacterial load. Further effects include restrictions on power plants and industrial sites that draw river water for cooling, since they may no longer discharge warmed water without exceeding temperature limits, reduced dilution of treated wastewater, pressure on water supply and irrigation in the surrounding area, and falling groundwater levels along the river that affect riparian vegetation and wells.