A strengthening heat wave is threatening to break temperature records from France and the UK to Spain and Germany, with the latest forecasts indicating 45°C (113°F) temperatures across southern France. On Monday, a temperature of 43.3°C (110°F) was recorded at Chateaumeillant in France, according to government forecaster Météo-France. Daytime highs are forecast to climb as high as 42°C in parts of western France through Thursday, with some weather models hinting at brutal heat on Tuesday and Wednesday, with peak afternoon temperatures potentially reaching 43-45°C across much of central, northern, western, and southwestern France. In southern England, temperatures will rise rapidly on Tuesday before climbing to a peak of at least 39°C on Wednesday and Thursday, according to the Met Office. This would shatter the all-time high for June of 35.6°C, reached in 1957 and 1976. Yale Climate Connections reports that temperatures could hit 100°F (38°C) in London and 104°F (40°C) in Paris – not just once, but perhaps for two or three days in a row. The heat wave is particularly dangerous due to high humidity, which could lead to some of the most dangerously high heat indexes several countries have ever recorded.
French authorities have issued red heat warnings for 54 departments, covering Paris and the western half of the country, as reported by Business Standard. The French government issued nationwide bans on public drinking of alcohol, and a record-high 35 out of 96 mainland French regions were placed under "danger-to-life" red alerts, according to Yale Climate Connections. Heat alerts were posted Monday by 26 countries, from Ireland to Greece, as soaring temperatures deliver one of Western Europe's worst June heat waves on record. High temperatures have already set local temperature records in many cities. Red heat warnings have also been issued for Germany, Luxembourg and Switzerland, with amber and yellow alerts in effect for much of mainland Europe. UK health authorities have issued red warnings for life-threatening temperatures on Wednesday and Thursday covering the southern half of England, including London, with amber heat alerts across the north. The Met Office issued a Red Extreme Heat Warning – only the second such warning issued in British history – for Wednesday and Thursday, covering most of southern England and eastern Wales, including the London area. Many of France's mainland departments are under an extreme "Red Alert," with southwestern regions bracing for a prolonged 45°C (113°F) plateau lasting several consecutive days.
Europe's energy grid is being put to the test as the continent swelters under its third heatwave of the year, with electricity demand surging dramatically. During the early summer heatwave of 2025, France recorded an evening electricity peak 25 per cent above the off-season average due to cooling demand, despite the country having relatively low air conditioning ownership. Space cooling consumed around 7 per cent of the world's electricity in 2022, according to the International Energy Agency. Compare the Market analysis of 85 countries found that Greece leads globally with electricity demand increasing by 38.62 per cent during extreme heat periods, followed by Montenegro at 22.49 per cent and Türkiye at 21.91 per cent. When overall electricity demand exceeds available generation capacity, it can cause electrical frequency drops – potentially triggering blackouts. Among European countries analyzed, Hungary recorded the longest average outage duration at 2.92 hours per year, followed by Slovenia at 2.16 hours and Greece at 1.63 hours. Italy faces the highest estimated annual household cost at €154.7 million, followed by Poland at €152.1 million.
The heat wave is causing widespread disruptions across Europe, with hundreds of schools shutting or closing early while train services in busy cities like Paris and Brussels have been reduced to cut breakdown risks. Paris' Fête de la Musique festival went ahead over the weekend, but the government banned guests from drinking alcohol in public places to reduce dehydration risks. Several drownings were reported in France on Sunday as people sought relief from temperatures that set records for June at more than 180 locations, as well as several all-time records above 40°C (104°F). Health officials have warned about the cumulative health effects of "tropical nights," where evening lows don't drop below 20°C, which can worsen sleep and exhaustion across a population with very little air conditioning in homes and other buildings. The Met Office warned of widespread "tropical nights," meaning those where the low fails to dip below 68°F (20°C), which is extremely unusual for the UK. Only about 20% of European homes have air conditioning, compared to around 90% in the United States, making the heat particularly dangerous.
Despite the record-breaking heat, renewable energy sources are providing crucial support to Europe's power grid. According to energy thinktank Ember, record EU solar generation helped keep power supply stable amid the spike in demand. "In the peak days of the heatwave, solar delivered up to 50 GW of power in Germany alone, generating 33-39 per cent of Germany's electricity," Ember states. "Germany has 14 GW of battery storage and 10 GW of pumped storage, which helped to store some solar to use when the sun went down." This contrasts with June and July last year when Europe experienced a heatwave that saw temperatures hit 40°C, triggering daily power demand to increase by up to 14 per cent and leading to a two to three times increase in average daily power prices. The combination of record solar generation and energy storage systems has helped prevent the vicious cycle of increased greenhouse gas emissions that can make extreme heat events even more frequent.
