500 hPa geopotential and sea surface pressure over Europe, 29.06 18 UTC Source: wetterzentrale	2 m maximum temperature over the Iberian Peninsula, 30.06 18 UTC Source: wetterzentrale	2 m maximum temperature over Central Europe, 02.07 18 UTC Source: wetterzentrale	EFI and SOT Index for the 2 m maximum temperature for 02.07 over Europe Source: ECMWF

Heat wave
Western and Central Europe

Issued: Sunday, June 29, 2025, 13:00 UTC

An intense heatwave is continuing to impact Western and Central Europe. Over the Iberian Peninsula, extreme heat with temperatures of up 45 °C is forecasted until Wednesday, July 02, 2025. Over France, temperatures of more than 40 °C must be expected from Monday, June 30, 2025, to Wednesday, July 02, 2025. Over Germany, the highest temperatures are forecasted for Wednesday with maxima approaching the 40 °C mark.

29.06.2025

A large ridge has expanded across Europe. With the ridge, extremely warm air masses can penetrate far northeastwards across Europe. 850 hPa temperatures of more than 20 °C are measured over Europe. As a result, extreme heat is impacting large parts of Western and Central Europe. Beginning today, June 29, 2025, temperatures of more than 40 °C are forecasted across the southern parts of the Iberian Peninsula. Locally, maximum temperatures of up to 45 °C are possible. Over France, from Monday, June 30, 2025, to Wednesday, July 02, 2025, maximum temperatures of more than 40 °C are likely. On Wednesday, temperatures of up to 42 °C may be measured in Paris, close to the record of 42.6 °C measured in July 2019.

Over Germany, the heatwave is expected to last until Thursday, July 03, 2025. From Monday onwards, temperatures of more than 35 °C are expected along the Upper Rhine Valley. Over Western Germany, the most intense heat is forecasted for Tuesday, July 01, 2025, and Wednesday. July 02, 2025. Over Eastern Germany, the highest temperatures are forecast for Thursday. Both on Wednesday and Thursday, temperatures of up to 39 °C may occur. There is the potential for temperatures of 40 °C or more along the Rhine Valley. This would be the earliest 40+ °C reading in Germany. At present time, the earliest reading of a 40+ °C temperature occurred at Kitzingen, BY with 40.3 °C on July 05, 2015. The ensemble data currently does not give the potential that the temperature records from the late-July heatwave in 2019 will be surpassed. Nevertheless, high overnight low temperatures in metropolitan areas will lead to elevated heat stress levels. Often temperatures will not drop below 20 °C in metropolitan areas of Southern Germany until Friday, July 04, 2025.

Already by Monday, the strong diurnal insolation will give the potential for local convection to form along the Alps and over Southern Germany. By Wednesday, a trough over the British Isles will start to increase its impact on the weather over Western and Central Europe. Colder air masses will reach Central Europe by Thursday. The time that which these colder air masses reach certain parts of Central Europe remains uncertain. Additionally, the strength of thunderstorms forming along this cold front remains highly uncertain.

500 hPa geopotential and sea surface pressure over Europe, 28.06 12 UTC Source: wetterzentrale	850 hPa temperature and geopotential over Europe, 30.06 18 UTC Source: wetterzentrale	2 m maximum temperature over Europe, 01.07 18 UTC Source: wetterzentrale	850 hPa temperature spread and geopotential over Europe, 03.07 00 UTC Source: wetterzentrale

Heat wave
Western and Central Europe

Issued: Thursday, June 26, 2025, 14:30 UTC

A major heat wave is forecasted to impact Western and Central Europe until the first weekend of July 2025. Temperatures are likely to remain well above average for an extended time. Over Western Europe, maximum temperatures of more than 40 °C may occur on separate occasions. In Central Europe, temperatures of more than 35 °C are likely in the first days of July 2025.

26.06.2025

The synoptic set-up over Europe in late June 2025 is dominated by a strong low-pressure system south of Iceland and a high-pressure ridge extending from the Azores into Central Europe. In such a synoptic set-up, very warm air masses can penetrate across the European Continent. Advected from the Sahara, a blob of hot air masses will move along the ridge, expanding across Western and Central Europe. 850 hPa temperatures within this blob are likely to surpass 25 °C. Over the Iberian Peninsula, a stretch of exceptionally hot weather will commence on Saturday, June 28, 2025. Temperatures as hot as 45 °C may occur in the southern parts of the peninsula from June 30, 2025, to July 03, 2025.

With the ridge expanding into Central Europe over the weekend, the hot air masses can advance into France. The 40 °C mark has already been surpassed here yesterday, June 25, 2025, with a maximum temperature of 41.5 °C at Ceret. Until June 28, 2025, temperatures will drop slightly. Nevertheless, maximum temperatures will remain above the 30 °C mark in large parts of France. From June 29, 2025, to July 03, 2025, the hottest temperatures of the approaching heat wave are forecasted to impact France. In Southern and Central France, maximum temperatures may reach more than 40 °C for multiple days during that period.

Over Central Europe, maximum temperatures will likely remain above the 30 °C from Saturday, June 28, 2025, to next week’s Thursday, July 03, 2025. The highest temperatures will impact the Upper Rhine Valley. In this region, daily maximum temperatures of more than 35 °C are forecasted from June 29, 2025, to July 03, 2025. Currently, NWP models suggest that the peak of the heatwave in Central Europe may occur on June 30 and July 01, 2025. Temperatures of more than 37 °C are forecasted in Western Germany. Outlier solutions in the ensembles for Western Germany show the potential for temperatures close to the 40 °C mark early next week. Heat stress levels will be elevated additionally in metropolitan areas of high overnight low temperatures. Especially in the bigger cities of Southern Germany, minimum temperatures of more than 20 °C are likely.

In the first days of July 2025, a trough over the British Isles will impact the weather across Western and Central Europe. Signals of some convective activity are already present in coarse global NWP models by early next week. Due to the long lead time, NWP output remains uncertain, but ensembles tend to converge to a solution with colder airmasses reaching Western Europe by July 02, 2025, and Central Europe by July 03, 2025. With this transition to cooler airmasses, enhanced convective activity may occur. Though the degree of both the cooling and the convective activity remains unclear at present.