People have been flocking to parks and beaches to make the most of the sun
The UK has seen its hottest day of the year so far with temperatures reaching 27C (80.6F), the Met Office has said.
The hottest place was Port Solent, Hampshire, which peaked at 27.2C, while above average temperatures included Glasgow, which reached 26.5C.
However, forecasters warn temperatures will begin to cool in Scotland on Tuesday, spreading across the UK by the end of the week.
A temperature drop of seven to 10 degrees Celsius is predicted.
Sunday, the second warmest day of the year so far, saw temperatures hit 26.9C at Port Solent. London reached 24.9C, Glasgow 24.2C, Castlederg 24.6C and Rhyl 23.6C.
Water dangers
The heat led to warnings from emergency services after three children drowned while swimming on Sunday.
Nine-year-old Jordan Paul Baker, from Connah's Quay, disappeared while snorkelling with his family in strong currents of the River Dee in Flintshire.
Martin Moriarty, 13, died in the Junction Pool on the River Tweed, near Kelso, in the Scottish Borders.
And Ryan Walker, 15, from Holmegate, Derbyshire, was also found dead on Sunday night at Far Hill Quarry, near Ashover.
Changes are already taking place, with cooler air moving into the north of Scotland
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.
Bookmark with:
What are these?