Question 1

How warm is the Rhine?

Accepted Answer

The Rhine in Basel currently has a water temperature of 21.3 °C.

Question 2

What is the air temperature on the Rhine in Basel?

Accepted Answer

The air temperature at the Rhine in Basel is currently 18.6 °C.

Question 3

Is it currently safe to swim in the Rhine in Basel?

Accepted Answer

The current swimming recommendation is Excellent. The water quality (bacterial) is rated as Excellent and physical safety as Safe. This estimate is based on precipitation, global radiation, and water temperature.

Question 4

How long after rain should you wait before swimming in the Rhine?

Accepted Answer

After heavy rainfall, it is recommended to wait 48 to 72 hours before swimming. Our recommendation takes into account the decay of bacterial load (e.g., from combined sewer overflows) and the disinfecting effect of global radiation.

Question 5

At what temperature does the risk of cold shock occur?

Accepted Answer

A risk of cold shock exists at water temperatures below 14°C. This can lead to uncontrolled gasping and hyperventilation. From 18°C, the Rhine is considered safe for experienced swimmers, provided there are no bacterial risks.

Question 6

What is the difference between water quality and swimmer safety?

Accepted Answer

Water quality assesses microbiological contamination (bacteria like E. coli), while swimmer safety considers physical factors such as water temperature (cold shock) and current.

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Water temperature

Air temperature

Water level