A third heatwave this year has brought temperatures as high as 34C to the capital - and more sizzling weather is on the way.
It follows record-breaking temperatures at the end of June, with heat and humidity playing havoc with public services as Londoners sweltered and flocked to lidos across the city.
Temperatures reached 37.7C in Norfolk on June 26, making it the hottest June day on record.
An unprecedented heatwave in late May saw temperatures reach 35.1C in Kew Gardens - the highest temperature for the month ever recorded in the UK.
Now, the mercury is on the rise once again, with 34C reached on Monday as the third heatwave of the year took hold.
What’s the forecast for the next few days?
According to the Met Office’s latest forecast (as of 7am on Thursday), daily peak temperatures will stay above the 28C threshold for an official heatwave through to early next week.
After that, temperatures are predicted to drop slightly, with 27C forecast for Tuesday - before rising back up to 29C on Wednesday.
If this pans out, it would mean London will have basked in an nine-day heatwave. On Wednesday, the same forecaster was predicting an eight-day heatwave with the peak temperature dropping below 28C on Monday.
The heatwave is likely to reach an “absolute peak” on Thursday and Friday - with 36C possible in London - according to BBC Weather’s Tomasz Schafernaker, before dropping to around 30C over the weekend.
Could the heatwave last even longer?
BBC Weather’s Chris Fawkes, speaking on BBC Radio 4’s Today on Wednesday, said current forecasts mean the heatwave is likely to be “incredibly long-lived” in parts of the UK.
He added: “Somewhere in the UK is likely to reach 30C not just through the rest of this week., through the weekend but through the whole of next week as well.”
It would only take a small upward tick in forecasted temperatures for that prediction to apply to London.