Easter Saturday was the warmest day of the year so far, according to the Met Office.
The temperature hit 25.5C in Gosport, Hampshire, at approximately 3.30pm, and the mercury could rise as high as 27C on Easter Monday, says Met Office forecaster Helen Roberts.
She said: "The very warm sunshine continues right through the bank holiday weekend. We could still see more record-breaking temperatures tomorrow and on Easter Monday too.
"It is the hottest day of the year so far."
Thousands flocked to beaches along the south coast to enjoy the unseasonal weather. The Met Office said that this weekend's temperatures are around 10C higher in many places compared with the average for this time of year.
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.
Ms Roberts said that these last two temperatures are "the ones to keep an eye on, and could be broken" this weekend.
She said that the top temperature for this Good Friday was 24.5C at Wisley in Surrey, ahead of plenty of varied sunshine for the rest of the UK.
Bookmaker Ladbrokes has cut odds from 5/6 to just 8/11 for this year to see the hottest Easter Sunday on record.
Alex Apati of Ladbrokes said: "Brits have been treated to a scorching start to the Easter weekend and things will only get hotter if the latest odds are anything to go by."