A tourist holds an umbrella as protection from the sun during a heatwave near the Eiffel Tower, in Paris, on June 30, 2025. French authorities put Paris on red alert for extreme heat.
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A marine heat wave in the Mediterranean Sea is combining with a powerful heat dome to cause Europe to swelter under a brutal early summer heat wave.

It is a pattern that is popping up frequently as the planet warms: the influence of Mediterranean marine heat waves has been more pronounced in recent summers, with the ocean heat playing a role in spiking temperatures on land, contributing to deadly floods and stoking devastating fires.

Water temperatures in the Mediterranean Sea are up to 9 degrees above average for this time of year amid a significant marine heat wave.

A tourist holds an umbrella as protection from the sun during a heatwave near the Eiffel Tower, in Paris, on June 30, 2025. French authorities put Paris on red alert for extreme heat.
French authorities put Paris on red alert for extreme heat. (Ludovic Marin/AFP/Getty Images via CNN Newsource)

The most intense warming is present in the western Mediterranean, including just south of France.

This is causing high humidity to surge north and to keep temperatures elevated at night across the heat wave-affected regions.

The heat wave, which also involves hot air flowing north from Africa, is also reinforcing the marine heat wave in a feedback cycle.

Temperatures have broken records in Spain and Portugal as swaths of Europe brace for more records to fall through Wednesday as the heat wave intensifies.

Temperatures in the Spanish town El Granado spiked to 46 degrees on Sunday, setting a new national record for June, according to Spain’s national meteorological service AEMET.

Last month was Spain’s hottest June in recorded history, as temperatures “pulverised records,” AEMET said on Tuesday.

In Portugal, a provisional temperature of 46.6 degrees was recorded in the city of Mora, about 130km east of Lisbon, according to the country’s weather service IPMA, which would be a new national record for June.

Scorching heat is sweeping almost the entirety of France.

Multiple towns and cities endured temperatures above 37 degrees Celsius on Monday, according to provisional recordings from Météo France.

People take advantage of water mist fountains in Valencia, Spain on June 21, 2025, as parts of the country experience a heatwave.
People take advantage of water mist fountains in Valencia, Spain. (Michael Robinson Chávez/Getty Images)

A red heat wave warning, the highest designation, is in place for 16 French départements Tuesday, including Île-de-France, where Paris is located.

The Eiffel Tower summit is closed to tourists Tuesday and Wednesday, with staff asking their would-be visitors to take precautions during the searing heat.

“We apologise for the inconvenience caused, Eiffel Tower staff wrote on the landmark’s website.

“During this period of high temperatures, please remember to protect yourselves from the sun and stay hydrated regularly.”

Schools across France also closed as the country baked under scorching temperatures this week.

The United Kingdom is also sweltering, now currently enduring its second heat wave of the summer.

Temperatures pushed above 32 degrees Celsius on Monday, making for very uncomfortable conditions in a country where fewer than 5 per cent of homes have air conditioning.

“The current June-July heatwave is exposing millions of Europeans to high heat stress,” Samantha Burgess, strategic lead for climate at the European Centre for Medium-Range Weather Forecasting, said in a statement.

“The temperatures observed recently are more typical of the months of July and August and tend to only happen a few times each summer.”

Wimbledon tennis spectators use handheld fans to cool themselves down during the first round match between Russia's Daniil Medvedev and France's Benjamin Bonzi in London on June 30, 2025.
Wimbledon tennis spectators use handheld fans to cool themselves down. (Isabel Infantes/Reuters via CNN Newsource)

Wildfires are sweeping several countries as the temperatures spike. Fires broke out on Sunday in Aude, in the south-west of the country, burning nearly 161 hectares.

In Turkey, 50,000 people have been evacuated as firefighters tackle fierce blazes mostly in the western Izmir and Manisa provinces.

In parts of Italy, officials banned outdoor work including on construction sites and quarries during the hottest parts of the day.

Local authorities have devised creative ways to keep its residents cool, including free museum tours and “climate oases”.

Temperature records are also poised to fall on Wednesday in Germany as the heat dome expands east, and before a series of relief-providing cold fronts begin to swing into northwestern Europe from the west.

Human-caused climate change is causing heat waves to be more frequent, intense and long-lasting.

Europe is the fastest-warming continent, and is warming at twice the rate of the rest of the world.

Climate change is also leading to more frequent and intense marine heat waves.

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