On 3 August 2026, the average daily discharge of the Rhine at Basel‑Kleinhüningen was lower than 1 % of all daily measurements recorded since 2020. The flow ranged from a minimum of 350 m³/s to a maximum of 515 m³/s, with a mean of 443 m³/s. These values are exceptionally low for the time of year; the maximum discharge on this day ranked 30th out of the last 30 days, the lowest of all August days in the dataset since 2020, and the lowest of any day in the entire record since 2020.

Over the past 30 days, the highest discharge was 824 m³/s on 4 July 2026, and the lowest was 321 m³/s on 2 August 2026. Table 2 lists the months with the lowest flow conditions since 2020; August 2026 now appears as the second‑lowest on record, with a minimum average daily flow of 442 m³/s, only slightly above the record 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.