The recommended seasons for the Danube Cycle Path Passau-Vienna are:
The best times for the Danube Cycle Path are in spring May and June and in autumn September and October. In midsummer, in July and August, it can sometimes be a bit too hot to cycle during the day. But if you have children who are on holiday in summer, you will be on the Danube Cycle Path during this time and use the slightly cooler times of the day, such as in the morning and in the evening, to continue cycling. An advantage of the summer temperatures is that you can take a cool bath in the Danube. There are also beautiful places in the Wachau in Spitz an der Donau, in Weißenkirchen in der Wachau and in Rossatzbach. If you are traveling with a tent along the Danube Cycle Path, you will also enjoy the summer temperatures. In midsummer, however, it is advisable to get on your bike very early in the morning and spend the hotter days in the shade by the Danube. There is always a cool breeze right near the water. In the evening, when it gets cooler, you can do a few more kilometers.
In April the weather is still a bit unstable. On the other hand, it can be very nice to be out and about on the Danube Cycle Path in the Wachau during the time when the apricots are in bloom. At the end of August at the beginning of September there is always a change in the weather, as a result of which the stream of cyclists on the Danube Cycle Path decreases significantly, although ideal cycling weather prevails from the 2nd week of September to mid-October. It is particularly nice to be out and about on the Danube Cycle Path in the Wachau during this time, as the grape harvest begins at the end of September and you can watch the winegrowers harvest the grapes. There is often also the opportunity to taste the wine that is beginning to ferment, which is called “Sturm” in Lower Austria, when driving past a winegrower's farm.