It feels as though every summer there are articles all over the news about river cruises in Europe being severely disrupted by prolonged summer heatwaves and droughts.
Water levels on major waterways like the Rhine and Danube are at historic lows, meaning that guests are not getting the itinerary they expected, and many are being bussed from one place to another in heatwave conditions.
The best time to book your river cruise depends on weather, crowds, price – and what you want to see on your trip.
Unlike an ocean cruise, river levels can have a major impact on whether your itinerary operates as planned.
Too much water can be a problem, but too little water can be just as disruptive!
Water levels vary by river and year, so no month guarantees perfect conditions.
March And April: Beautiful, But Higher Water Can Be A Risk
I took a river cruise in March, one of the first cruises of the season.
Although the weather was cooler, we had no problems with water levels, and our sailing went exactly to plan.
We did have a few maintenance problems with the ship, but there are bound to be teething issues at the start of the cruise season, and it certainly didn’t spoil our holiday!
March and April is spring flower season, and great for tulip cruises in the Netherlands and Belgium.
Rivers can be higher because of spring rain and melting snow farther upstream.
High water can stop ships from passing underneath low bridges or make certain locks or ports inaccessible.
In extreme cases, ships may have to change the itinerary, or passengers may be transported by bus/coach.
The weather can also be chilly and wet – you can never tell what you are going to get.
Early season cruises are best for people who want spring scenery and don’t mind unpredictable weather.
We had blue skies, drizzly rain – and in Vienna it was clear, but so, so cold!
Have a look at that bargain off-season river cruise here:
May And June: Probably The Best All-Round Choice
Usually, May and June offer a great balance of comfortable temperatures, long daylight hours, and green scenery.
I always prefer to sail before the hottest and busiest part of the summer.
River levels are often good – though there are no guarantees.
Heavy rainfall can still cause high-water problems, particularly earlier in the period.
June can sometimes be affected by flooding after prolonged rain.
June would be my first pick for a European river cruise because you have a good chance of pleasant sightseeing weather, without having to travel in the hottest or driest part of the year.
July And August: Great Weather, But Low Water Can Become A Problem
In July and August, you are likely to experience warm weather and very long days.
It is great for sitting outside on the ship and spending lots of time on the sun deck.
But prolonged hot, dry weather can cause rivers to become too shallow for ships to navigate normally.
This is a particular problem on rivers such as the Rhine and the Danube.
When water gets too low, ships may not be able to sail through certain sections.
Itineraries can be altered at short notice, and passengers may be moved by bus or coach – which really defeats the object of taking a river cruise!
Some cruise lines may swap passengers between ships positioned on either side of the shallow section.
Low water isn’t guaranteed in summer. Some summers have no problems at all – but as I write ( August 2026), many river cruises have been cancelled or significantly altered due to some of the lowest water levels on record.
July and August are also among the busiest and hottest months for sightseeing.
I took a river cruise around Venice and the Venetian lagoon in August with Uniworld. I wasn’t worried about water levels in the way I would have been on a more traditional river cruise.
Uniworld are a luxury cruise line, so it was an expensive trip – and I soon realised why August prices were considerably lower than earlier or later in the year!
It was SO hot, it was hard to do much sightseeing. Uniworld did their best to arrange tours early in the morning or in the evening, but even then, the heat was stifling.
Have a look at that luxury river cruise here:
September: One Of The Best Times, But Watch What Summer Has Been Like
Often September is a fantastic month for river cruising.
It’s usually cooler and less crowded than July and August.
You can still enjoy good weather for walking around European towns and sightseeing. Once the peak-season crowds have gone, things should be far more enjoyable.
Autumn colours may start appearing later in the month, making it very beautiful.
However, if Europe has had a particularly hot and dry summer, low river levels can continue into September, so you could still have problems associated with low river levels.
September is great for weather and crowds, but it isn’t automatically safer from low-water disruption.
October: Pretty And Cooler, With Changing River Conditions
October is good for autumn colours and cooler sightseeing.
Lower cruise fares make October attractive too.
Wine regions can be especially interesting around harvest season.
There is more chance of rain as autumn progresses, but just make sure you pack appropriate clothing for the season.
Rain can actually improve river levels after a dry summer, although prolonged heavy rain can eventually create the opposite problem!
Days become noticeably shorter, and temperatures begin to drop.
It is a great time to explore for passengers who are more interested in sightseeing than sitting in the sun.
Late November And December: Best For Christmas Markets
Christmas market cruises are a completely different kind of river cruise.
The Rhine, the Main and the Danube rivers all run through Germany, and they are famous for their Christmas markets.
Switzerland, France, and the Netherlands are also really popular.
You can visit multiple cities or even multiple countries in a single week. You can get off and explore a new market every afternoon without dealing with winter driving in bad weather.
Ships are beautifully decorated with trees, lights, and garlands. You can stay warm inside while watching snowy villages and castles pass by your window.
Cruises offer seasonal treats on board. You can taste local gingerbread, roasted chestnuts, and bratwurst. You can also sip Glühwein (hot spiced wine) in collectable mugs that you get to keep.
Ships often bring local performers on board. You can listen to traditional choir music and learn about local traditions and festive history.
It is a great way to really experience the Christmas season in Europe, and these cruises are very popular.
River levels can still cause disruption as heavy winter rain can produce high water.
Low water can occasionally linger after an unusually dry autumn.
Cold weather isn’t usually the biggest problem. The amount of water in the river matters far more than whether it’s snowing.
Short daylight hours and cold temperatures mean less time sitting outside watching the scenery, but towns are likely to be lit up with wonderful, festive Christmas lights.
When I took a Christmas markets river trip, the water was so high that the itinerary changed – we even flew into a completely different airport than originally planned!
Water levels on the Rhine were described as “dangerously high” – have a look at that here:
January And February: The Worst Time For Most People
Far fewer European river cruises operate between January and February
Cruise lines use January and February to dry-dock their ships, deep-clean them, and sort out any maintenance issues.
Freezing temperatures, early darkness, and ice or high-water swells (meaning sudden or noticeable increases in water volume, height, and flow speed) can make navigation very difficult.
Christmas markets have finished, meaning passenger demand drops sharply before the spring season arrives and demand picks up again.
For the few winter routes that do run, passenger counts are low, and fares are heavily discounted.
You can get some much cheaper deals, compared to the peak summer or December holiday seasons.
Unless there is a specific itinerary you want or a certain reason you need to travel, there are usually much better months to choose from.
What Actually Happens If The River Is Too High?
High water levels are a problem because:
- Ships may not fit underneath low bridges.
- Locks or docking areas can become inaccessible.
- Strong currents can make navigation unsafe.
- Cruise lines may shorten or alter the route, and you may end up being bussed from one place to another.
What Happens If The River Is Too Low?
Record low water levels across Europe are causing problems because:
- The ship may physically be too deep to sail through shallow sections.
- River ships have very shallow drafts compared with ocean ships, but they still need a minimum depth.
- Cruise lines may change the itinerary from the one you booked at short notice.
- You might have to travel by bus or coach for part of the journey.
- Cruise lines may swap passengers onto another ship further along the river, meaning you have to pack and unpack all over again.
- Occasionally, they arrange hotel stays instead – you might not feel like you are getting good value for money, as often the cost of the hotel is far below the cost of the cruise you originally booked.
Different ships have different drafts, so one cruise line may sometimes continue sailing when another cannot.
Some of my favourite river cruises have been “Barge and Bike” cruises onboard the converted Dutch barge called Merlin.
She is smaller than conventional river ships, meaning Merlin has continued to sail through the European rivers when other, larger river ships have been unable to do so.
She also has the advantage of being a privately owned barge, meaning that they can alter the itinerary at short notice to give guests the best possible holiday experience.
Have a look at my amazing adventures through Europe on Merlin here:
Can You Book A Month To Avoid River-Level Problems?
No, water levels are unpredictable!
You can work out when high water or low water is more likely, but river levels depend heavily on recent rainfall, snowfall and temperatures.
Weather conditions can change quite quickly.
River level problems are a risk you take when booking a river cruise. Don’t avoid river cruising because of this – but understand that itinerary changes are more likely than with ocean cruising.
So When Is The Best Time?
In my opinion:
- Best time overall: May, June or September.
- Higher-water risk is more associated with spring rain/snowmelt and periods of prolonged heavy rain.
- Lower-water risk: more associated with late summer and early autumn after prolonged hot, dry weather.
- Best for Christmas markets: late November and December.
- Worst overall for most people: January and February due to bad weather and river conditions.
There really isn’t any completely “safe” month to book. But I wouldn’t let that put me off booking a river cruise. I would book when there is the least chance of disruption – and hope for the best!
Before You Go
River cruising is very different to ocean cruising. Find out why here:
7 Things Ocean Cruisers Get Wrong About River Cruising
When you see prices for river cruises advertised, the price shown is usually for the cheapest cabin on the lowest deck – not the balcony cabins you see on the adverts! Have a look at those cabins here:
Inside the Cheapest Cabins on a River Cruise Ship: What Are “Underwater” Cabins Really Like?
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