Rhine/Moselle Tourist Boats affected by low water levels?

"I know there is no way to predict, wondering if anyone is there now, who has any thoughts about the chance the tourist boats will be being affected in that particular area?"

As you said, there's no way to predict what things will be like 5-6 weeks from now; it's equally impossible for individuals who might be traveling there or even living there now to have accurate thoughts about the problem.

The good thing is that you can get everywhere you mention and other places too by train and bus, no matter how low the water levels might be. You'll get there a lot more quickly - and for FREE, btw, because you're staying in Boppard, where all guests receive the VRM Guest ticket:

https://www.vrminfo.de/en/tickets/tickets/ticket-offers/network-tickets/

Any/all cruise tickets can be bought at the boat docks. You needn't worry about buying them in advance, if that's your concern.

We did a Rhine cruise in September a few years back. I noticed that there were a lot of trains. If the boats are not running, perhaps have a back up plan to use the train? I can't speak to the Moselle.

It was a lovely trip. We have plans to go back, especially for the Moselle, and we will use public transportation.

You might try posting on Cruise Critic: there are already a number of active threads about low water levels:

https://boards.cruisecritic.com/forum/115-river-cruising/

But as Russ said, no one can predict what things will look like 5-6 weeks from now.

@jules about the Mosel: This map should help with your planning; it shows the Mosel River and all train stops on the Koblenz > Trier route. The rails stick fairly close to the river most of the way, but the Mosel is so windy that it made sense to the engineers not to follow it exactly... so it takes shortcuts and goes through tunnels here and there.

https://www.vrminfo.de/fileadmin/data/pdf/2017/RLP-Ticket_streckennetz.pdf

Do you see the little offshoot that goes to Traben-Trarbach? That's the Mosel Wine Railway (Moselweinbahn) and you can board the trains on that line in Bullay.

http://www.alpenbahnen.net/assets/images/autogen/k-IMG_2375.png

Traben-Trarbach is a good place to initiate an upstream cruise to Bernkastel, a major Mosel destination. (Of course you can cruise downstream as well from Bernkastel.)

The Rhine is lined with railways on both sides; the map that follows shows those as well as the ferry crossings and cruise boat docks:

http://www.loreley-info.com/eng/rhein-rhine/walking-hiking.php

I saw someplace the Viking River cruises were affected at several places along the Rhine and the Main, a passenger reporting last week that the trip down the Rhine was by bus...though they did have a day on the river using the tourist boats, which I assume are much shallower draft.

Of course by late September, things could get worse, but likely, with seasonal rains, it usually improves

As others said, everywhere there is a scenic boat, there is a train running parallel to it. In fact the best strategy is use the boat for down river, and the train to return up river.

I am in Boppard right now and almost all cruises and liners are suspended. Only small liners like the "Rheinkrone" are still running, whereas the historic Paddle wheel ship "Goethe" has not been able to sail for four weeks. On the Mosel, traffic is running almost normally because the water level here is regulated by locks.
However, the weather is changing and heavy rains are expected next week.

This is sad but unfortunately not surprising with this summer's drought. Thanks for the update.

Thanks Russ! I'm really excited about doing a Rhine/Mosel trip at some point. I will probably tie in Luxembourg. I agree with Paul, and further, when we did our Viking Cruise, my husband chatted with the captain for a bit. He mentioned that the cruises that go down river (Basel to Amsterdam) are easier for planning and thus the ship runs closer to schedule than up river.

@OP, I hope you will do a trip report. Your trip is on our radar.

Simple answer to the question asked: 6 weeks is not enough time to get enough rain to change anything about river levels in big rivers much... Even massive individual rainfall events are rarely wide enough to affect an entire river system. Have fun on the trains.

Two weeks ago Boppard boats could not dock there. To get to Bacharach, take the train....Mistake: It wasn't Boppard, but instead, Oberwesel where the water level was too low to dock.

We were scheduled on the K-D Goethe on 8/13 departing from Koblenz. Trip was cancelled due to low water on the Rhine. K-D was running their more modern boats on other days/routes as they do not require as much water as the Goethe. BTW, K-D provided a fast, 100% refund.