The mini-heatwave won’t last long, as temperatures are predicted to take a nose dive on Thursday.
Temperatures in London are expected to drop to 15C and Good Friday is on course to be even chillier still at just 12C, as a cool front moves in from the north.
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Rain is likely on Easter Sunday and there could even be snow on Easter Monday, says The Weather Outlook.
Tuesday saw the UK record its second warmest March day on record and the hottest temperature for the month in 53 years, the Met Office said.
The mercury peaked at 24.5C at Kew Gardens in west London on March 30, with St James's Park in the centre of the capital also hitting highs of 24.3C.
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The figure is only slightly below the UK's hottest ever March temperature of 25.6C, recorded in 1968 at Mepal in Cambridgeshire.
Met Office forecaster Alex Burkill said it was a "possibility" that the record temperature of 25.6C could be broken today.
The mercury spiked at 23.9C in Weybourne, north Norfolk, this afternoon - but temperatures across the south-east and London could rise higher into the evening.
Cops have banned booze in parks, and beachgoers have been told to stay away today as Brits enjoy their newfound freedom during the midweek Spring scorcher.