Rhine water quality is continuously monitored at the Rheinüberwachungsstation Weil am Rhein (RÜS). This insight focuses on the temperature parameter in June 2026.

In June 2026, the Rhine at the monitoring station experienced a wide range of temperatures. The average temperature for the month was 21.4 degrees Celsius. The month began with a temperature of 21.8 degrees on June 1 and ended significantly warmer at 26.3 degrees on June 30. The coldest day was June 18, with an average temperature of just 8.7 degrees, while the warmest day was June 30, reaching 26.3 degrees.

Looking at historic June temperatures since records began in 2002, the average has typically ranged from about 15 to 21 degrees. The coolest June on record was 2013, with an average of 15.2 degrees, while the warmest was 2003, also averaging 21.4 degrees. June 2026 tied that record, making it an unusually warm month. However, the very low minimum temperature of 8.7 degrees on June 18 stands out as an extreme cold snap within an otherwise warm month. Based on the last day's measurement of 26.3 degrees, the water is very warm and pleasant for swimming. 🏊 Remember to be cautious and always check conditions before entering the river. For more information, read about Schwimmen im Rhein or install the BachApp for real-time updates.