Britain's southern beaches will be packed today as temperatures on Sunday reach a sweltering 78F (26C) as experts say summer has officially arrived.
Bright blue skies are expected to last all day in the south, while the rain will continue to fall in parts of Northern England and southern Scotland.
Rain in the north will give way to scattered showers and localised flooding with thundery weather heading into Monday. Some of those storm clouds could return to the south by Thursday with a cloudy start to the week forecast.
However, temperatures are expected to rise by the second week in June, starting off what is expected to be a scorching summer month.
Thousands of visitors took to the beach in Brighton and Hove as hot and sunny weather his hitting the seaside resort
Men run along the sea front on Sunday morning as the sun beamed down over Brighton. Temperatures are expected to reach 90F in June
The beach in Brighton was packed on Sunday as sun seekers headed for the seaside. Temperatures were expected to hit 70F
Dozens flocked to Cote Brasserie for breakfast where they enjoyed eating outside in the sunshine in Birmingham
Dog owners got out early this morning before the sun becomes too hot for pets. One woman walked her dog on the beach so it could cool off in the sea
There was sunshine in Portsmouth on Saturday for the HM the Queens 65th Coronation Anniversary. Pictured: HMS Warrior
Sun seekers took to the pebbles in Worthing this morning to make the most of the rays as forecasters say summer is coming
HMS Warrior at Portsmouth Historic Dockyard, with HMS Queen Elizabeth in the background, including a 21 Gun salute commemorating HM the Queens 65th Coronation Anniversary on Saturday
Southern Scotland and northern England is expected to see heavier rainfall than the rest of the country on Sunday and the beginning of the week but summer is set to bake the nation in June
Worthing beach was busy with families early on Sunday morning as Britain basked in the sunshine which will stay for June
Morning visitors took in the warm sunshine along Birmingham's Central Canal in the city centre as the sun shone on Sunday
Crowds flocked to Weymouth beach as the coastal fog cleared and the temperature shot up. There are still flood warnings in the north
Bookmaker Coral has slashed the odds again on the hottest June on record, this time to 6-4 from 2-1, as the sun continues to beat down.
Leon Brown, head of meteorological operations at The Weather Channel, said temperatures could push 90F.
He added: 'The hottest weather is forecast in the first half of summer, with a warmer-than-average June and 32C highs expected.
'But the pattern of warmth from the continental changes in July, meaning a risk of rain for Wimbledon, with more unsettled Atlantic fronts forecast.
'August's school holidays look like seeing above-average rainfall, and below-normal temperatures at times.'
Hotspells in the second week of June will signal the start of summer, according to forecasters, who have also warned it could be slow to begin, this week.
James Madden, forecaster for Exacta Weather, said: We expect it to turn increasingly warmer through the first week of the month with many parts of the country basking in temperatures in the mid 20Cs.
'It could be rather muggy and humid with some variable cloud cover, but when the sun does come out it will feel extremely hot as summer gets underway.'
An umpire holds a pint of beer as he waits for play to restart during a match between the Ship Inn Cricket team and Obolensky's Heroes CC played on Elie Beach in Scotland
Beaches were overcast in Scotland on Sunday but that did not stop fun and games who took to the sand to watch the cricket
Members of the Ship Inn Cricket team prepare the pitch during a match against Obolensky's Heroes CC played on Elie Beach
The clouds covered any chance of sunshine on Elie Beach in Scotland but the cricket team carried on regardless. The Ship Inn claims to be the only pub in Britain to have a cricket tThe warmer weather follows storms across the country just days ago.
The Met Office revealed this weekend that May was the UK's hottest ever after it released its provisional data for the month.Forecasters have rolled out yellow weather warnings for Central, Tayside & Fife, East Midlands, East of England, Grampian, Highlands & Eilean Siar, North East England, North West England, Northern Ireland, south west Scotland, Lothian Borders, Strathclyde, West Midland and Yorkshire & Humber.
Gregg said showers will be 'hit and miss and not everyone will see them' but that the risk of thunder, lightning and rain will continue into tomorrow and on Monday.
The odds on the hottest day in June ever have now plummeted as a heatwave looks likely.
'We're expecting a prolonged few days of warm weather now and everything is pointing towards one of, if not the hottest June's we've ever seen,' said Coral's Harry Aitkenhead.
The firm have also cut the odds on the hottest June day of all time, which is currently 35.6C recorded back in 1976. It is 5-2 that we see that record tumble this month.
'It remains a long way away but with the long range forecasts we simply can't rule out the hottest June day the UK has ever seen,' added Aitkenhead.