Weather experts are saying that the first storms should hit on Friday evening as the low pressure "Zeljko“ moves in from the southwest.
There is a risk of tornadoes and winds of up to 100 km/h, warns Focus.
North Rhine-Westphalia is set to be hit by the low pressure on Friday evening with around 40 liters of rain per square meter expected to fall.
The storm is expected to travel up the west of the country, meaning that Berlin and other eastern cities should be shielded from the worst of it.
By Saturday evening the low pressure should have reached the north sea.
The dangers posed by the storm should not be ruled out, despite the fact that winds will be weaker than autumn and winter blasts.
Because trees are in full bloom, less wind is needed to blow them over.
"Walking and camping in the woods should be avoided at all costs,“ Christian Herold from the German Weather Service (DWD) told Focus. Even driving under trees could be dangerous, he warned.
Zeljko will bring an end to the hot weather with temperatures averaging at 20 degrees in the north. But in Bavaria and other southern states things will stay much more summery, at around 25 degrees.