People up and down the country are entering into the working week after a weekend of near endless sunshine.
Temperatures soared to 19°C in some parts of the country, around 10°C higher than average for the time of year.
But the Met Office has warned the unseasonably warm weather is not likely to last past the middle of the week.
Getting a tan on the South Bank in central London (Picture: PA)
A man enjoys the sun on the foreshore of the river Thames (Picture: PA)In Wales, the west coast beauty spot of Gogerddan, in Cardiganshire recorded a record-breaking 19.1°C, making it the warmest Welsh day in February since 1990.
The previous Welsh record was 18.6°C set in the south Wales village of Velindre 29 years ago.
Man killed as friend left him for dead after motorbike crashes into wallHampton Water Works, in the south west of London, was the hottest spot in England at 19C, with Londoners spilling out of pub gardens and sunbathing in parks to enjoy the surprise sunshine.
Down in Dorset crowds headed to the beach to enjoy the warm weather which is expected to continue today and on Tuesday, where it might hit 19°C once again.
Temperatures could even break the record for February, when the mercury soared to 19.7°C in Greenwich, London, in 1998.
People enjoy boat rides in the Serpenting in Hyde Park, London (Picture: AFP)
Sunbathing in Hyde Park, central London (Picture: AFP)
Readers enjoyed the sunny weather on Primrose Hill in London (Picture: Reuters)A spokesman for the Met Office said Sunday’s hot weather made it the fourth day in a row that temperatures stayed above 18°C.
But by the middle of the week, temperatures should be back to normal.
‘Monday and Tuesday will be the last of the very mild days with temperatures coming back to average levels after that,’ the spokesman added.
The temperature might have been affected by a phenomenon known as the Foehn Effect, a dry and warm down-slope wind that occurs to the lee of hills or mountains.
Monday started with fog warnings over Hereford, Worcester and Gloucester as well as in York, Leeds and parts of Sheffield.
A lovely day for a paddle on Sunday in Dorset (Picture: PA)
Paddle boarders enjoy the warm weather and calm seas off of Boscombe beach in Dorset (Picture: PA)Forecasters say the fog will clear through the morning when hazy sunshine will return.
By Thursday, the weather is expected to return to normal for the time of year, with more unsettled showers and colder temperatures.
Delay to Brexit vote means we’re going to get just 17 days notice about EU departureLong-range forecasts for March suggest we won’t see a return to the hot Spring-like weather we have enjoyed this month.
The Met Office says: ‘Many areas may see some showery rain, but the northwest of the UK is most likely to see wetter, windier conditions.
‘Strong winds and gales in exposed areas are possible, particularly in the northwest, with snow at times over high ground here.
People managed a swim in the sea on Boscombe beach in Dorset on Sunday (Picture: PA)
This picture of heavy snow in County Durham was taken on February 27 last year and highlights the contrast in conditions (Picture: Getty Images)‘Temperatures should return nearer to normal, and it will feel quite cold in any windy spells.’
The sunshine Britain enjoyed this weekend was in stark contrast to conditions a year ago when the country was gripped by the effects of the Beast from the East.
Exactly 12 months ago the UK was blanketed in snow with temperatures dropping to minus degrees.