Around 40,000 people are running the 26-mile race across London today as the Met Office confirmed the 23.2C temperature today beat the current record for the marathon of 22.7C in 1996.
Among the runners is Katie Price, who is wearing a set of giant inflatable lungs on behalf of the British Lung Foundation.
She has joined a number of celebrities donning their running shoes including Chris Evans, Gordon Ramsay, and Great British Bake Off contestant Selasi Gbormittah.
London Fire Brigade crews who tackled the Grenfell Tower blaze are also running today in full equipment and a police officer stabbed in the London Bridge terror attack is taking part.
Sir Mo Farah was earlier delayed in the elite marathon when he was given the wrong water bottle.
The four-time Olympic champion eventually got the drink he wanted and he went on to place third – smashing the British record with his time of 2:06:21.
Wheelchair athlete David Weir earlier secured his eighth London marathon title, while Kenyan Vivian Cheruiyot was first to pass the finish line in the elite women's race.
There are 750,000 people are currently lining the streets to show their support.
some runners have been receiving medical treatment after collapsing in the heat, with temperatures on the track likely to feel higher.
Met Office spokesman Grahame Madge said: "But a big caveat here is obviously a weather station temperature record will feel a bit different to what it might feel like trackside where you have the warmth coming up from the tarmac and other people.
"Trackside temperatures will probably feel even warmer than that, so the advice to runners is to look at the forecast and prepare for the fact that this could be one of the warmer marathons."
MARATHON ROUTE Where will 40,000-plus runners race in the big 2018 event?
Around 40,000 people are now taking part in the gruelling 26-mile event today across central London after the Queen sounded the klaxon.
Those taking part have been urged to rethink fancy dress and stay hydrated as wall-to-wall sunshine is predicted.
Organisers have emailed participants ahead of the event with safety advice on running in the heat.
They are planning to put more water, ice and shower stations along the 26.2 mile route to allow runners to cool down.
Hugh Brasher, event director, said in a statement: "We have reminded them that they should adjust their goal for Sunday and plan to run at a slower pace and, if they were planning to run in fancy dress, they should think carefully if that is appropriate in these conditions.
"There is plenty of water available and runners should drink according to their thirst and use spare water to douse their head and neck."
The marathon starts at 10am in Greenwich Park, taking a tour around the capital and passing over the Thames at Tower Bridge before crossing the finish line on The Mall in front of Buckingham Palace.
The mini heatwave Brits enjoyed this week saw the mercury nudge a balmy 29.1C – the hottest April day in 70 years.
But the Met Office has issued a yellow warning for rain and said some flooding is "likely" and could affect the East Midlands, North East England, North West England, Wales and Yorkshire and Humber.
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