Outdoor public events have been banned in an area of France as a record-breaking heatwave swept across Europe on Saturday.
Concerts and large public gatherings have been called off in the Gironde region around Bordeaux.
Parts of France hit 40C on Saturday.
Scientists say periods of intense heat are becoming more frequent and longer lasting as a result of global warming.
Spain, Italy and the UK are also experiencing high temperatures.
In Gironde, officials said public events, including some of the official 18 June Resistance celebrations, will be prohibited "until the end of the heat wave".
Indoor events at venues without air-conditioning are also banned.
"Everyone now faces a health risk", local official Fabienne Buccio told Bleu radio.
The French interior ministry warned people to be extremely careful and not expose themselves to the weather.
State forecaster Meteo France said it was the earliest hot spell ever to hit the country, which has been caused by a mass of hot air moving from north Africa.
Temperatures could hit 39C in Paris and droughts have also raised the risk of wildfires, the forecaster said.
The increased use of air-conditioners and fans was forcing France to import electricity from neighbouring countries, grid operator RTE said.
In Spain, which has just experienced its hottest May since the beginning of the century, temperatures are forecast to hit highs of 43C this weekend, the Aemet weather service said.
Forest fires have burned 22,240 acres of land in the northwest Sierra de la Culebra region, forcing some 200 people from their homes, regional authorities said.
More than 3,000 people were evacuated from the Puy du Fou theme park in central Spain due to a fierce fire nearby.
Water is so low in large stretches of Italy's largest river, the Po, that people are able to walk through the middle of the expanse of sand and wartime shipwrecks are resurfacing.
In the UK, temperatures are expected to reach 33C in southern England, while a level three heat-health alert has been issued for London.
Temperatures are due to relent slightly from Sunday with thunderstorms forecast in parts of France and elsewhere in Europe.
Experts warned that the high temperatures were caused by worrying climate change trends.
"As a result of climate change, heatwaves are starting earlier," said Clare Nullis, a spokeswoman for the World Meteorological Organisation in Geneva.
"What we're witnessing today is unfortunately a foretaste of the future" if concentrations of greenhouse gases in the atmosphere continue to rise and push global warming towards 2 Celsius from pre-industrial levels."
JERSEY INFO
Red Jersey
General Classification: worn daily, starting from Stage 2, by the leader of the General Classification by time.
Green Jersey
Points Classification: worn daily, starting from Stage 2, by the fastest sprinter, who has obtained the best positions in each stage and intermediate sprints.
White Jersey
Young Rider Classification: worn daily, starting from Stage 2, by the best young rider born after January 1, 1995 in the overall classification by time (U25).
Black Jersey
Intermediate Sprint Classification: worn daily, starting from Stage 2, by the rider who has gained the most Intermediate Sprint Points.
The finalists
Player of the Century, 2001-2020: Cristiano Ronaldo (Juventus), Lionel Messi (Barcelona), Mohamed Salah (Liverpool), Ronaldinho
Coach of the Century, 2001-2020: Pep Guardiola (Manchester City), Jose Mourinho (Tottenham Hotspur), Zinedine Zidane (Real Madrid), Sir Alex Ferguson
Club of the Century, 2001-2020: Al Ahly (Egypt), Bayern Munich (Germany), Barcelona (Spain), Real Madrid (Spain)
Player of the Year: Cristiano Ronaldo, Lionel Messi, Robert Lewandowski (Bayern Munich)
Club of the Year: Bayern Munich, Liverpool, Real Madrid
Coach of the Year: Gian Piero Gasperini (Atalanta), Hans-Dieter Flick (Bayern Munich), Jurgen Klopp (Liverpool)
Agent of the Century, 2001-2020: Giovanni Branchini, Jorge Mendes, Mino Raiola
The National's picks
4.35pm: Tilal Al Khalediah
5.10pm: Continous
5.45pm: Raging Torrent
6.20pm: West Acre
7pm: Flood Zone
7.40pm: Straight No Chaser
8.15pm: Romantic Warrior
8.50pm: Calandogan
9.30pm: Forever Young
The specs
Price: From Dh180,000 (estimate)
Engine: 2.0-litre turbocharged and supercharged in-line four-cylinder
Transmission: Eight-speed automatic
Power: 320hp @ 5,700rpm
Torque: 400Nm @ 2,200rpm
Fuel economy, combined: 9.7L / 100km
2025 Fifa Club World Cup groups
Group A: Palmeiras, Porto, Al Ahly, Inter Miami.
Group B: Paris Saint-Germain, Atletico Madrid, Botafogo, Seattle.
Group C: Bayern Munich, Auckland City, Boca Juniors, Benfica.
Group D: Flamengo, ES Tunis, Chelsea, Leon.
Group E: River Plate, Urawa, Monterrey, Inter Milan.
Group F: Fluminense, Borussia Dortmund, Ulsan, Mamelodi Sundowns.
Group G: Manchester City, Wydad, Al Ain, Juventus.
Group H: Real Madrid, Al Hilal, Pachuca, Salzburg.
World record transfers
1. Kylian Mbappe - to Real Madrid in 2017/18 - €180 million (Dh770.4m - if a deal goes through)
2. Paul Pogba - to Manchester United in 2016/17 - €105m
3. Gareth Bale - to Real Madrid in 2013/14 - €101m
4. Cristiano Ronaldo - to Real Madrid in 2009/10 - €94m
5. Gonzalo Higuain - to Juventus in 2016/17 - €90m
6. Neymar - to Barcelona in 2013/14 - €88.2m
7. Romelu Lukaku - to Manchester United in 2017/18 - €84.7m
8. Luis Suarez - to Barcelona in 2014/15 - €81.72m
9. Angel di Maria - to Manchester United in 2014/15 - €75m
10. James Rodriguez - to Real Madrid in 2014/15 - €75m
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