By Tom Watling And Tara Cobham
The UK is set for one of the hottest June days on record, with highs of 34C serving tennis fans a sweltering start to Wimbledon on Monday.
Much of England will enter a fourth day of a heatwave on Monday, forecast to be hotter than holiday spots in Barbados, Jamaica and Mexico.
Since 1960, UK temperatures in June have surpassed 34C in only three years, with the hottest being 35.6C, recorded on June 28 1976.
Wimbledon is set for its hottest opening day ever on Monday, with temperatures expected to surpass the previous record of 29.3C set on June 25 2001.
Parts of south-east England could then hit 35C on Tuesday.
How long will the UK heatwave last?
The UK recorded its warmest day of the year earlier in the month when a provisional high of 33.2C was noted by the Met Office on 21 June in Charlwood, Surrey.
The Met Office said several places in England and one or two areas in Wales, including Cardiff, entered a heatwave on 20 June.
Britons are now enjoying a second bout of warm weather and sunshine, with much of England entering a fourth day of a heatwave on Monday.
Sunday reached 31C in parts of southeast England, but Monday will be even hotter, with highs of 34C in central and eastern England, the Met Office said. The South East could then hit 35C on Tuesday, according to the forecaster.
An official heatwave is recorded when areas reach a certain temperature for three consecutive days, with thresholds varying from 25C to 28C in different parts of the UK.
However, Scotland and Northern Ireland face heavy rain and cooler temperatures during this period.
Then on Wednesday, the Met Office suggests the heatwave could come to end.
It forecast: 鈥淔resher for all, with cloudier skies bringing spells of rain, these sometimes heavy on Wednesday and Friday, but some drier, brighter intervals as well. Temperatures near or slightly above average.鈥
What warnings are in place for the heatwave?
A second amber heat health alert in two weeks came into force on Friday, warning the high temperatures could cause an increase in deaths.
The alert, which covers London, the East Midlands, the South East, the South West and the East of England, will last until 6pm on Tuesday.
The UK Health Security Agency (UKHSA) also issued a yellow alert for Yorkshire and Humber and the West Midlands for the same time period, warning of significant impacts on health and social care services.
An amber alert was previously issued for all regions in England on 19 June, the first time it had been used since September 2023.
The London Fire Brigade has also warned of a 鈥渟evere鈥 risk of wildfires.
Assistant commissioner Thomas Goodall said: 鈥淟ondon is already facing its second heatwave of the year and we know that people will be looking forward to getting outside to enjoy the wonderful weather.
鈥淏ut the high temperatures and low rainfall in recent months means the current risk of wildfires is severe.
鈥淪o far this year, firefighters have responded to around 14 wildfires in the capital.
鈥淭here have also been countless callouts to smaller fires involving grass, trees and in other outdoor spaces, as well as in people鈥檚 gardens.
鈥淒uring this latest heatwave, it is important everyone acts responsibly to prevent fires from occurring.
鈥淎s the weather has been so dry, it only takes a few sparks to lead to a fire spreading rapidly.
鈥淚n London, this is can be dangerous because so many of our green spaces lie close to homes and other properties.鈥