20:27
Tieng Anh Vui
The north-west of England and the western fringes of Scotland look set to be the warmest parts of the country on Saturday as the heatwave continues.
BBC Weather's Philip Avery said temperatures could hit 30C (86F) along the west of Great Britain.
The level three heatwave warning issued by the Met Office remains in place for western England and at two for the east of the country.
Temperatures next week could get as high as the mid-30s, Mr Avery said.
On Saturday, while the entire UK will see plenty of sunshine, the east will be cooler.
Low cloud could mean that on some parts of the east coast temperatures could drop to 17C (62.6F) or 18C (64.4F).
Heatwave warnings alert healthcare services to help those in high-risk groups such as the elderly and young children.
Friday was the hottest day of the year in Scotland, Wales and Northern Ireland.
Temperatures reached 29C (84.2F) at Prestwick, South Ayrshire, 31C (87.8F) at Porthmadog, north Wales, and 30C at Castlederg, Co Tyrone.
The warm weather has had a number of effects.
HM Coastguard has issued safety advice to swimmers and sailors after call-outs in the past month were up by nearly a quarter compared with the same period last year - as more people take to the coast to enjoy the sunshine.
And firefighters had to tackle a grass fire at the southern edge of Epping Forest in east London.
Too hot to sweat
Normally, when it is hot, the body copes by sweating.
As sweat evaporates, the body cools down.
But if humidity is high, that process is impaired
That's when you feel hot, sticky, and uncomfortable.
The NHS advises people to keep cool by wearing loose clothes, staying indoors in the coolest rooms and splashing faces and necks with cold water.
People with underlying health issues, particularly heart and breathing problems, are likely to suffer more.
- Met Office weather warnings
- BBC Weather Centre
- The effects of extreme heat
- Age UK: How to stay cool during a heatwave
- NHS: Heatwave - be prepared
Research by the London School of Hygiene and Tropical Medicine has estimated there might have been between 540 and 760 extra deaths in England and 60 to 100 in Wales due to the hot weather.
Level three alerts are triggered when threshold temperatures have been reached for one day and the following night, and the forecast for the next day has a greater than 90% confidence level that the day threshold temperature will again be met.
Level two warnings are also currently in place for the East Midlands and Yorkshire and the Humber. These alerts are triggered by a 60% or higher chance of the threshold temperature again being reached on the second day.
North-east England remains on a level one warning.
Scotland, Wales and Northern Ireland are not included in the alert system.
Temperatures are expected to increase again early next week with an increase in humidity, Mr Avery said.
There is a likelihood of level three being reached again in some areas.
It is the UK's first prolonged heatwave since 2006, with six consecutive days of temperatures above 30C.
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