The UK has recorded the hottest day of 2016 so far as temperatures hit 34.4C in Gravesend on 13 September. The Met Office has also confirmed that this makes it the hottest September day in 105 years.
Thousands of Britons have been enjoying the sun across the party, particularly in the southeast, which saw the best of the warm weather.
The hashtag "heatwave" was trending across the UK on 13 September and health warnings were issued by Public Health England and NHS England.
Temperatures in London on Tuesday meant that the capital was warmer than some of the world's summer hotspots – including Barcelona, Miami and Rome.
The highest ever temperature for September was recorded in 1906 when mercury hit 35.6C in Bawtry, South Yorkshire. It is unlikely that this record will be beaten in 2016.
The rest of the week is also set to see above average temperatures, with highs of 30C in the southeast and temperatures in the high 20s for the rest of England. However, the heatwave conditions are set to blow away by the end of the week.
A spokesperson for the Met Office told IBTimes UK: "At the moment it looks as though the warm air will be squeezed away eastwards towards the end of the week, with less settled weather spreading to most parts."
Despite the record-breaking day, weather experts have said that the warm temperatures are not unusual for this time of year. The Met Office noted that the seas around the UK are at their warmest in September, which means that as long as there is a warm air mass above or near the UK, temperatures are prevented from dipping too much.