After a chilly start to May that had many Germans reaching for winter coats, the country is bracing for a dramatic shift in weather. By midweek, a strong early-summer high-pressure system will establish itself over southwestern Europe, setting the stage for a Pentecost heatwave that could push temperatures to near 30°C.
The driving force behind this change is the jet stream, a band of strong winds at around nine kilometres altitude. According to meteorologist Martin Puchegger of wetter.com, the jet stream will track well north of the high-pressure area over the coming days, allowing a ridge of high pressure to extend from Spain across central Europe. At the same time, an upper-level low forming over the Bay of Biscay and Brittany will help funnel very warm air from southern regions toward Germany.
From Unsettled to Sizzling
Until midweek, the weather will remain changeable. The German Weather Service (DWD) forecasts Tuesday and Wednesday to bring dense cloud, showers, and intense thunderstorms, especially in the east, with highs between 14°C and 22°C. But from Thursday, the heat will arrive: in the southwest, temperatures could climb to 26°C, though showers and thunderstorms may still affect the northeastern half of the country.
Over the Pentecost weekend, forecasters expect widespread highs of 22°C to 28°C, with peak values of up to 31°C along the Upper Rhine, in the Rhine-Main region, and toward Brandenburg. Weather expert Dominik Jung noted that the hottest day is likely to be Whit Monday. Climatologically, 30°C at Pentecost is not unprecedented but remains relatively rare: for the 1991–2020 reference period, nationwide maximum temperatures in late May range from 22°C to 26°C, depending on the region. A first hot day near Pentecost now occurs roughly every three to four years—significantly more often than in the 1980s.
This heatwave is part of a broader pattern of extreme weather across Europe. Earlier this month, Spain braced for its first heatwave of 2025, with temperatures soaring to 38°C. The increasing frequency of such events has raised concerns about the impacts of climate change on the continent. A recent analysis by World Weather Attribution warned of hazardous heat at the 2026 World Cup, highlighting the growing risks for outdoor events.
For Germany, the Pentecost heatwave will be a welcome change after a cool spring, but it also serves as a reminder of the shifting climate norms. As the jet stream continues to behave unpredictably, Europeans can expect more frequent swings between unseasonably cool and hot conditions.
