Torrential rain hit the UK last night, causing severe flooding and travel chaos, with the London Fire Brigade taking over 1,000 flood-related calls.
Firefighters in North London had to carry some walkers to safety after roads were flooded by water gushing off Hampstead Heath while Hammersmith and Fulham declared an emergency as sewers overflowed and poured into homes.
One person even decided to take a jet ski out onto the street because there was so much water.
Yet this all comes just as parts of the UK are expected to be bathed in a heatwave, with an average of 24C forecast for central and southern England from Tuesday.
Pictures show roads with rivers of water running through them, cars partly submerged and people in summery clothes standing in the deepening flood on Monday night.
The weather caused complete chaos as trains and Tube stations were affected in London causing delays and line suspensions.
The capital was hit with the most severe flooding, although all of the South East had heavy rain while Edinburgh also got a flood warning.
One lane of the M6 between junction 32 and 31A near Preston was also closed because of flooding on the carriageway while a nearby school, Penwortham Girls' High, will be shut today because of "significant flooding"
Areas just south of Peterborough was also hit with a yellow weather warning for rain from the Met Office last night, which means homes and businesses could be damaged and travel disruption is likely.
The Environment Agency also issued flood warnings for Basingstoke in Hampshire and north-west of Edinburgh.
People were advised to avoid driving and be careful in Dorset as The Environment Agency South West reported intense rainfall causing serious surface-level flooding.
Around three inches of rain fell in London in just 90 minutes last night - and the Circle line still remains suspended this morning (Tuesday July 13) because of it.
Euston station was closed because of the flooding, as were certain London Underground stations including Chalk Farm, Hampstead and Wimbledon.
TfL said: "Staff have been working overnight across the network working to repair the damage caused by the rain/flood waters."
Videos and photos shared across social media show landmark parts of the capital completely awash as the flash floods take hold.
A clip shows a river of water gushing down Portobello Road while a photo shows rain water seeping across the grass on Primrose Hill.
The London Fire Brigade was called out to South End Green after a group of walkers were trapped by water pouring off of Hampstead Heath.
Hammersmith and Fulham borough had to declare an emergency last night as the excess rain caused sewers to overflow and enter some people's homes.
The floods appear to be the calm before the storm as the UK is expected to be hit with a heatwave from today.
Average temperatures in parts of Central and Southern England, including London, are forecast to be 24C on Tuesday and this will creep up as the week goes on, with the weekend hitting 28C.
The North of England and Scotland will stay cooler, with average temperatures sticking at around 18C.
