Temperatures are predicted to reach 25C in parts of the United Kingdom later on Monday as people enjoy the long weekend and newly restored freedoms following the lifting of many lockdown restrictions.
The wettest locations, receiving more than twice the average rainfall, were southwest and northeast England, as well as Wales and parts of eastern Scotland.
Temperatures are expected to be at least in the low 20s for most parts of the United Kingdom, even northern Scotland. A weather front to the west of Ireland will bring high cloud to N. Ireland.
The region was basking in glorious sunshine, still conditions, and some of the highest temperatures in the UK.
People out enjoying the sunshine this bank holiday weekend in Inverleith Park in Edinburgh.
Forecasters at the Met Office warned people to slap on plenty of sun cream as UV light levels will be high or very high.
Becky Mitchell, a meteorologist from the Met Office, said: "We could potentially get to the hottest day of the year but definitely by tomorrow".
This was 0.1C higher than the previous warmest temperature of 2021 - a 24.5C which was recorded at Kew Gardens back on March 30.
The UK could see record temperatures for the second day in a row on Tuesday after the mercury hit 25C for the warmest day of the year so far on bank holiday Monday.
She continued: "The only exception is along the east coast - there is quite a lot of low cloud, mist and fog in east coastal areas and that will stay for the next few days, so highs of between 12C and 16C there - quite a lot lower than elsewhere".
Although a fine bank holiday is rare, the temperatures are not unusual for the time of year, with the mercury usually sitting in the high teens and low 20s by late May.
Mitchell said: "That could go up to 27C in one or two spots by Wednesday, that is pretty warm for the time of year but not record breaking and not exceptional".
"We're looking again at some very warm sunshine around for many northern and eastern parts of the United Kingdom, but thundery showers will start to push in across south-west England and Wales by Wednesday morning", Mr Petagna added.
May has been the fourth wettest on record for the United Kingdom, and the wettest ever for Wales.