Rozina Sini
BBC News

Image source, Supplied

Emilia Moll says it is "unbearable" sleeping in her 15th-floor flat in the centre of Manchester this week.

Her apartment is south-facing, with two big glass windows, and it heats up the living room "unbelievably", she says.

"It's a case of the fan being on constantly... We don't have any air-conditioned spaces in the building as far as I know," she says.

The 26-year-old has lived there for 10 months and says sleep is a "nightmare".

Emilia goes to her air-conditioned office once a week, but is constantly thinking about her cat Reggie in the heat. She leaves the fan on and lots of water out for him at home.

Did you get any sleep last night? Let us know.

Chris Fawkes
BBC Weather presenter

Our full overnight temperature data is in.

Kenley hasn't beaten the June warmest night record that was set during this heatwave on Wednesday night at 23.5C in Bute Park, Cardiff.

Many areas of England and Wales did have a "tropical night" where temperatures didn't fall any lower than 20C.

Herstmonceux, East Sussex had the highest provisional overnight temperature that I've seen at 22.7C.

People should drink responsibly and avoid exercising outdoors during the heatwave, a chief at the UK's largest ambulance service has warned the public.

London Ambulance Service says it has recorded its highest ever number of life-threatening emergencies during the heatwave, "driven by the extreme heat" across the capital.

Ambulance crews responded to a record 642 Category 1 calls on Wednesday, chief operating officer Craig Harman says, adding he expects “demand to grow day on day over the next couple of days”.

Category 1 incidents include the most serious, life-threatening injuries and illnesses including cardiac arrests and patients who are not breathing.

At least six NHS trusts in England have declared critical incidents because of the heatwave, sources have told the BBC.

Chris Fawkes
BBC Weather presenter

Image source, Getty Images

Our unprecedented June heatwave continues today with a red extreme heat warning in force for central southern England and south-east England with heat-related health dangers and problems for infrastructure continuing.

We have some thunderstorms for north Wales, northern England and a few in the Midlands this morning clearing northwards, but otherwise lots of sunshine today.

Temperatures aren't as extreme for Wales, but it will still be hot for southern and eastern areas with temperatures reaching 28C.

England will have temperatures widely push over the 30C mark and in East Anglia and southeast England temperatures will peak at 35-37C, threatening the June records again.

Temperatures in Northern Ireland and Scotland will reach about 28C, not quite as high as yesterday, but still hot. There will be some hazy sunshine and some thunderstorms with some heavy downpours and a threat of localised flooding.

Thunderstorms will break out tonight and tomorrow across the UK, hit and miss in nature, with the biggest storms bringing a risk of flash-flooding and some large hail.

How are you coping with the heat and what's the weather like where you are? Send us your pictures and tips for staying cool.

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While it was another hot night for many, we've also spotted some dramatic photos of stormy weather overnight sent in to BBC Weather Watchers.

Here are some of the best snaps we've seen so far, taken in Cornwall and Bristol:

Image source, BBC Weather Watchers/@Del Bond

Image source, BBC Weather Watchers/@Mike Robinson

Image source, BBC Weather Watchers/@westcountrysnaps

Chris Fawkes
BBC Weather presenter

I'm sounding like a broken record with all the records that were provisionally broken yesterday.

The UK and England's hottest June day on record: 36.7C at Merryfield, Somerset.

Wales' hottest June day on record: 35.9C at Bute Park, Cardiff.

Northern Ireland equalled its hottest June day on record, with 30.8C recorded in Castlederg in County Tyrone.

It looks like there's the possibility of another record on the way too.

Last night it seems temperatures in Kenley, Surrey didn't drop below 24.2C. This would beat the warmest June night record - we'll have the complete overnight data set to check in an hour or so to know for sure.

Image source, Getty Images

The Met Office's red warning for extreme heat means an "exceptional spell" of hot and humid weather can be expected across London and south-east England again today.

The Met Office says to expect population-wide impacts, affecting not just those who are most vulnerable to extreme heat, including serious illness or danger to life.

The service says "substantial changes" in working practices and daily routines will be required, while there is also a high risk of heat-sensitive systems and equipment failing.

This could result in power cuts and the loss of other essential services such as water, electricity, gas or mobile phone signal.

Furthermore, delays on roads and road closures are expected alongside delays and cancellations to rail and air travel. Those who experience even moderate delays on such services are at risk of significant welfare issues.

There is also an increased risk of water safety incidents, due to significantly more people visiting coastal areas, lakes and rivers.

A rare red warning of extreme heat, external is in place for London and parts of south-eastern England until 21:00 BST today, meaning there is a risk to people's health and possible transport disruption.

Within the red warning area temperatures could peak for some at 37C or 38C.

An amber warning for extreme heat, external, lasting until 23:59 covers south-east England, eastern England and parts of the Midlands.

Temperatures in the wider amber warning stretching across the Midlands and East Anglia are still likely to reach the low 30s.

Warnings are also in force for thunderstorms across Scotland, Northern Ireland, and parts of England and Wales too. These will be fierce but localised.

It will feel significantly cooler on Friday in Northern Ireland and Scotland.

Image source, BBC Weather Watchers/@ruthiebabes

A rare red warning of extreme heat is in place for London and parts of south-eastern England until 21:00 BST, affecting millions of people for the third consecutive day.

It comes after the hottest ever June day on Thursday, with temperatures reaching 36.7C in Merryfield, Somerset.

All four of the UK's nations also recorded their highest temperatures of the year so far.

During the heatwave, schools have closed, a hosepipe ban has been brought in for people in Kent and train services have been disrupted.

On Wednesday, the UK saw its warmest June night on record, according to provisional figures, with overnight temperatures in Cardiff not dropping below 23.5C, exceeding the previous record of 22.7C set in 1976.

But that record may have been broken again overnight, following the soaring daytime temperatures.

Our teams across the UK, as well as BBC Weather, will bring you the latest updates and advice on how to stay cool throughout the day.