The Met Office says all four of the UK nations have recorded their hottest Easter Monday on record.
The weather bureau said a high of 25C was recorded in England, with top temperatures in Scotland, Wales and Northern Ireland reaching 23.6C, 23.5C and 21.4C respectively.
It comes after Wales, Scotland and Northern Ireland each enjoyed their warmest Easter Sunday on record, the Met Office said.
The UK’s warmest Easter temperature was the 29.4C recorded at Camden Square in London on Easter Saturday in 1949.
The other warmest Easter weekend days include the 26.9C recorded at London’s St James’s Park on Good Friday in 2011 – when the mercury also reached 25.3C on Easter Sunday and 24C on Easter Monday, both in the Solent.
Met Office forecaster Marco Petagna said: “We have got high pressure moving at the moment giving most of the UK a lot of fine weather, this combined with the fact that the high pressure has dominated for the past few days is allowing the temperatures to heat and build.”
Many Brits made the most of the last day of the bank holiday weekend, packing beaches and parks to soak up the spring sunshine.
Some were pictured cooling off in the sea in Broadstairs, Kent, while children played in the Ross Fountain in Edinburgh’s West Princes Street Gardens.
However, firefighters are battling a large moor fire, near Huddersfield, West Yorkshire.
The National Trust said the blaze, covering 300 hectares of Marsden Moor, is likely to have been started by a barbecue on Sunday.