The Met Office has issued its first ever amber extreme heat warning for parts of the UK until midnight on Thursday.
The Extreme Heat Warning, which is issued with public health partners across the UK, will cover a large part of Wales, all of southwest England and parts of southern and central England.
It comes as the forecast continues to show unusually high temperatures – particularly for western areas, and after Sunday was recorded as the hottest day of the year in England and Wales.
Scorching temperatures hit the UK today with Brits flocking to beaches and parks on Freedom Day.
It will be another humid night with 16C mercury levels making it difficult to sleep for Brits.
Tomorrow will be another mostly sunny and hot day with higher temperatures extending further north into Northern Ireland and southern Scotland, the Met Office said.
Met Office Chief Operational Meteorologist Steven Ramsdale said: “The high temperatures are going to continue through a large part of this week.
“Many areas will continue to reach heatwave thresholds but the amber extreme heat warning focusses on western areas where the most unusually high temperatures are likely to persist.
“There’s a continuing risk of isolated thundery downpours late in the afternoons but most areas will stay dry until later in the week.
“Temperatures should begin to fall for most areas heading into the weekend, with some more unsettled conditions looking to develop.”
It is the first time the warning has been issued since the Met Office said last month that it would launch weather warnings for extreme heat after a record-breaking number of heatwave deaths were recorded in England last summer.