In Wales, Tuesday’s top temperature was 25.8 in Usk.
But conditions for most people living north of the Midlands were cool and cloudy on Tuesday, with Scotland’s high 19.7 in Drumnadrochit and Northern Ireland’s 20.5 in Killowen.
Forecasters say temperatures in the south-east will fall to the mid-20s on Wednesday, with some heavy showers across the far south-east of England, north-east England and eastern Scotland.
Flooding alerts have been issued for parts of northern and central Scotland.
However, those in the south-east will still face a warm Tuesday night.
Several amber heat health alerts issued by the UK Health Security Agency remain in place until Wednesday morning for Yorkshire and the Humber, East Midlands, West Midlands, East of England, London and both south England regions.
It came as Europe remained gripped by an intense heatwave, with France, Spain, Portugal, Italy, Germany and the Balkans all experiencing scorching heat in recent days.
The average temperature across England was 16.9C throughout June and 15.2C for the UK, according to the Met Office.
That tops June 2023, when the mean temperature was 16.7C – and it comes after the Met Office previously confirmed this spring was the warmest ever.
Little significant heat-related disruption was reported on Tuesday – but in the Scottish Highlands and neighbouring Moray, firefighters tackled moorland wildfires for a fourth day in a row.
