Yes it is a bit of a worry but I checked the weather forecast and rain is predicted in the next 10 days. See below. It does not take much rain to make a dfference to the water levels so hopefully since have about a month to go all will be well.
https://weather.com/weather/tenday/l/Rhine+Valley+Germany+GMXX9486:1:GM
Not sure that link is working so just copy and paste into your computer
