On September 5th, 2025, the discharge of the Rhine River at the Basel-Kleinhüningen station was notably low. The minimum discharge for the day was 1,248 m³/s, which falls below the 5th percentile for September, indicating an unusually low flow. The minimum discharge ranks 7th among the lowest values ever recorded for this month, highlighting a significant hydrological anomaly. The maximum discharge for the day was 2,062 m³/s, and the mean discharge was 1,551 m³/s. These values, while not as extreme as the minimum, are still noteworthy, with the maximum discharge sitting at the 98th percentile for the month, suggesting a wide range of flow conditions.

Over the past 30 days, the Rhine River has shown considerable variability in discharge. The highest discharge recorded was 2,062 m³/s on September 5th, while the lowest was 676 m³/s on August 19th. This range of nearly 1,400 m³/s indicates significant fluctuations in river flow, likely influenced by varying weather patterns or upstream water management practices. The variability is higher than usual, as reflected by the maximum discharge reaching the 100th percentile for the last 30 days.

When comparing the current day's discharge to historical values for September since 2020, today's flow stands out. The long-term mean discharge for September is approximately 894 m³/s, with historical minimum and maximum values of 354 m³/s and 3,272 m³/s, respectively. The current mean discharge of 1,551 m³/s is significantly above the long-term average, although it does not approach the historical maximum. This suggests that while today's flow is higher than average, it is not unprecedented in the context of historical extremes.

In summary, the Rhine River at Basel-Kleinhüningen experienced an unusually low minimum discharge on September 5th, 2025, with significant variability in flow over the past month. This highlights the dynamic nature of river conditions and the potential influences of climatic and hydrological factors on water levels.