September 2023 was world’s hottest September on record by ‘extraordinary’ margin, new data confirms, with scientists blaming more than climate change
September 2023 was not only the hottest September on record, new data has confirmed today, but it was warmer by a margin described by stunned scientists as “extraordinary”, “huge” and “whopping”.
It keeps the world on course for its hottest year ever, expected to be 1.4C warmer than before the industrial era.
The new record is just the latest to be shattered this year, following a record hot June, July and summer overall, and record hot September in the UK.
Scientists are pointing the finger primarily at climate change, and warned of worse to come. But they also put it down to a warm weather pattern called El Nino, and natural changes in the weather.
The Copernicus Climate Change Service (C3S) confirmed today that in September average surface air temperatures globally reached 16.38C.
The figure is 0.93C above the average for September during the last two decades, and a significant 0.5C warmer than the previous warmest ever September, in 2020.
The margin has astonished scientists.
Record heat in September smashed previous records by a “huge” 0.5C margin
“It’s huge,” said Professor Ed Hawkins, climate scientist at Reading University. “We shouldn’t be breaking records by this amount.”
Piers Forster – the interim chair of the government’s Climate Change Committee but speaking in his capacity as climate change professor at Leeds University – said variations between months each year are usually quite small.
“Therefore, breaking the previous September record by a whopping 0.5C is crazy and shows something really bizarre is going on,” he said.
Dr Samantha Burgess, deputy director of C3S, said the “unprecedented temperatures” for September broke records by “an extraordinary amount”.
With two months until the next global climate talks, COP28 in Dubai in December, the “urgency for ambitious climate action has never been more critical”, added Dr Burgess.
The sea was hot too
Today’s findings are based on billions of measurements from satellites, ships, aircraft and weather stations around the world.
They confirmed that temperatures on the ocean surface had also soared in September, reaching the second highest ever, behind only August 2023.
Scientists have also been alarmed by the record low sea ice cover in Antarctica, which C3S confirmed has continued into September.
It is fuelling worries that climate change is finally catching up with the continent once thought to be relatively shielded.
Source: National Snow and Ice Data Center
Why was September and this summer so hot globally?
Part of the heat has come from a natural switch in the tropical east Pacific around July from a cool El Nina phase to a warm El Nino one, influencing temperatures around the world.
But while a combination of factors are at play, including natural variability from year to year, scientists believe the main cause is climate change.
Prof Forster said: “We think it’s caused by a combination of factors, principally greenhouse gas emissions being at an all time high.”
Global temperatures have warmed by around 1.1C since the pre-industrial era due to human activity, according to UN’s Intergovernmental Panel on Climate Change.
“What we’re seeing this year is there is a bump on top of that,” said Prof Hawkins, which could be “due to other factors such as El Nino or other weather patterns”.
“But the largest component by far is the fact that we have added so much greenhouse gases in the atmosphere from burning fossil fuels.”
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UK climate deaths since 1990
Prof Hawkins said month after month of record heat was not necessarily a sign the climate crisis was accelerating, but a taste of the future under continued global warming.
Extreme weather events this summer – like fires in the Mediterranean, floods in New York or heatwaves in the UK – will become “more frequent and sadly become normal”, he added.
He said climate change is exacerbating flooding because warmer air can hold more water, meaning rainfall is heavier.
It also makes naturally occurring heatwaves even hotter, and it fuels the hot and dry conditions that allow wildfires to spread rapidly, even if the fires were sparked by something unrelated, he added.
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The twin threats of climate change and Russian malign activity in the Arctic must be taken “deadly seriously,” David Lammy has warned.
Sky News joined him on the furthest reaching tour of the Arctic by a British foreign secretary.
We travelled to Svalbard – a Norwegian archipelago that is the most northern settled land on Earth, 400 miles from the North Pole.
It is at the heart of an Arctic region facing growing geopolitical tension and feeling the brunt of climate change.
Mr Lammy told us the geopolitics of the region must be taken “deadly seriously” due to climate change and “the threats we’re seeing from Russia”.
We witnessed the direct impact of climate change along Svalbard’s coastline and inland waterways. There is less ice, we were told, compared to the past.
David Lammy and Norway’s Foreign Minister Barth Eide view the melting Blomstrandbreen glacier. Pic: PA
The melting ice is opening up the Arctic and allowing Russia more freedom to manoeuvre.
“We do see Russia’s shadow fleet using these waters,” Mr Lammy said. “We do see increased activity from submarines with nuclear capability under our waters and we do see hybrid sabotage of undersea cables at this time.”
In Tromso, further south, the foreign secretary was briefed by Norwegian military commanders.
The foreign secretary visiting SvalSat, a satellite ground station which monitors climate in Svalbard. Pic: PA
Vice Admiral Rune Andersen, the Chief of Norwegian Joint Headquarters, told Sky News the Russian threat was explicit.
“Russia has stated that they are in confrontation with the West and are utilising a lot of hybrid methods to undermine Western security,” he said.
But it’s not just Vladimir Putin they’re worried about. Norwegian observers are concerned by US president Donald Trump’s strange relationship with the Russian leader too.
Norwegian observers are concerned about the Russian leader – and Trump being ‘too soft’ on him. Pic: AP
Karsten Friis, a Norwegian defence and security analyst, told Sky News: “If he’s too soft on Putin, if he is kind of normalising relations with Russia, I wouldn’t be surprised.
“I would expect Russia to push us, to test us, to push borders, to see what we can do as Europeans.”
Changes in the Arctic mean new challenges for the NATO military alliance – including stepping up activity to deter threats, most of all from Russia.
More from Sky News:
Trump doubles down on Putin criticism
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In Iceland, we toured a NATO airbase with the foreign secretary.
There, he said maintaining robust presence in the Arctic was essential for western security.
“Let’s be clear, in this challenging geopolitical moment the high north and the Arctic is a heavily contested arena and we should be under no doubt that NATO and the UK need to protect it for our own national security.”
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This is also about distracting Russia, drawing away resources that could have been used in the war in Ukraine and deterring it in the future.
Because the more Arctic opens up, the more this once pristine wilderness is becoming the arena of national rivalry and potentially conflict.
World
‘What did they do to be burned and bombed?’: Charity calls on UK to offer Gaza children life-saving treatment
A British charity has written to the prime minister and foreign secretary, urging them to allow seriously ill children from Gaza into the UK to receive life-saving medical treatment.
Warning: This article contains images readers may find distressing
The co-founder of Project Pure Hope told Sky News it was way past the time for words.
“Now, we need action,” Omar Dinn said.
He’s identified two children inside Gaza who urgently need help and is appealing to the UK government to issue visas as a matter of urgency.
Israel-Gaza latest: Netanyahu reportedly accepts US ceasefire plan
Britain has taken only two patients from Gaza for medical treatment in 20 months of Israeli bombardment.
Children are among the bulk of the casualties in Gaza
“Most of the people affected by this catastrophe that’s unfolding in Gaza are children,” he continued. “And children are the most vulnerable.
“They have nothing to do with the politics, and we really just need to see them for what they are.
“They are children, just like my children, just like everybody’s children in this country – and we have the ability to help them.”
Sky News has been sent video blogs from British surgeons working in Gaza right now which show the conditions and difficulties they’re working under.
They prepare for potential immediate evacuation whilst facing long lists, mainly of children, needing life-saving emergency treatment day after day.
Dr Victoria Rose is a British surgeon working in southern Gaza’s last remaining hospital
Dr Victoria Rose told us: “Every time I come, I say it’s really bad, but this is on a completely different scale now. It’s mass casualties. It’s utter carnage.
“We are incapable of getting through this volume. We don’t have the personnel. We don’t have the medical supplies. And we really don’t have the facilities.
“We are the last standing hospital in the south of Gaza. We really are on our knees now.”
One of her patients is three-year-old Hatem, who was badly burned when an Israeli airstrike hit the family apartment.
Karam, aged one, has a birth defect that could be easily fixed with surgery
His pregnant mother and father were both killed, leaving him an orphan. He has 35 percent burns on his small body.
“It’s a massive burn for a little guy like this,” Dr Rose says. “He’s so adorable. His eyelids are burnt. His hands are burnt. His feet are burnt.”
Hatem’s grandfather barely leaves his hospital bedside. Hatem Senior told us: “What did these children do wrong to suffer such injuries? To be burned and bombed? We ask God to grant them healing.”
Hatem Senior
Listen to The World with Richard Engel and Yalda Hakim every Wednesday
The second child identified by the charity is Karam, who, aged one, is trying to survive in a tent in deeply unhygienic surroundings with a protruding intestine.
He’s suffering from a birth defect called Hirschsprung disease, which could be easily operated on with the right skills and equipment – unavailable to him in Gaza right now.
Read more:
Gaza doctor’s nine children killed
How the new Gaza aid rollout collapsed
Karam, aged one, has a birth defect that could be easily fixed with surgery
Karam’s mother Manal told our Gaza camera crew: “No matter how much I describe how much my son is suffering, I wouldn’t be able to describe it enough. I swear I am constantly crying.”
Children are among the bulk of casualties – some 16,000 have been killed, according to the latest figures from local health officials – and make up the majority of those being operated on, according to the British surgical team on the ground.
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