People enjoying the hot weekend out on the beach at Scarborough south bay (Image: Peter Harbour – North Yorkshire Live)

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Beaches around Britain have been packed full of people enjoying the glorious weather today.

Temperatures reached up to 27.9C in what has been labelled one of the hottest days of the year so far, with families basking in the sunshine.

But in what’s now become typical of the unpredictable weather in the UK, the sunshine is about to disappear to be replaced by wind and rain next week.

The Met Office has warned of "thunderstorms later on Wednesday through to Friday, with the potential for travel disruption and flooding".

Meteorologist Martin Bowles said: "It's nine degrees above average for June 13, so it is hot.

"It's not officially a heatwave as yet though, as we need three days of consecutive high temperatures."

Crowds enjoyed the sunshine at Southend beach

But the Met Office said yellow alerts had been put in place on June 16, 17 and 18, to warn of floods on the way.

"Homes and businesses could be flooded quickly, with damage to some buildings from floodwater, lightning strikes, hail and strong winds, a spokesperson said.

"Some communities become cut off by flooded roads [and] there is a slight chance that power cuts could occur and other services to some homes and businesses could be lost."

Temperatures reached nearly 28C
(Image: Peter Harbour – North Yorkshire Live)

Mr Bowles added that while the agency didn't normally issue thunderstorm alerts so far in advance, "we do think it will be severe, so we are alerting people of that".

Up to 50mm of rain is expected to fall over a three-hour period on Wednesday.

But today temperatures rose way above the mid twenties in some parts of the country.

Heathrow in London was the hottest spot at 27.9C – making it hotter than Ibiza and Monte Carlo's 27C, not to mention Tenerife's 26C.

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The hottest temperature recorded so far this year was 28.3C (82.94F) in Northolt, north-west London, on June 2.

But Mr Burkill said it was unlikely that temperatures would go above 30C during the heatwave, even if they rise again tomorrow.

"We are going to get close [but] it is unlikely we are going to get over 30C – it's going to be touch and go.

Beachgoers bask in the sun in Bournemouth
(Image: BNPS)

"It will be close as to whether we get to 28.3C," he said.

"If we don't, there's a chance we could get even higher temperatures on Monday when we could get 29C or 30C.”

The top temperatures were in the South East today, but the heat was widespread, enabling families up and down the country to take advantage.

People flocked to beaches in Cornwall and Sussex to sunbathe and cool down in the sea.

Crowds gather to enjoy the weather at Porthminster beach in St Ives, Cornwall
(Image: SWNS)

Parts of the country were bathed in sunshine yesterday too, with images showing people punting along the River Cam in Cambridge and strolling along the Long Walk in Windsor.

The Met Office said that the hottest temperature recorded on Saturday was 24.8C at Kew Gardens in London, with 24.6C at Heathrow and St James's Park as well.

The only place where temperatures weren’t so high was in the west of Scotland, which only reached the top teens and was cloudier with some outbreaks of rain.

By mid-week however, this is all due to change.

Crowds enjoyed the weather at Southend beach

"Rainfall totals of around 30mm could fall in an hour, with some locations potentially receiving around 50mm in two-to-three hours, although these will be fairly isolated," said the Met Office.

The Weather Outlook confirmed the forecast adding: "The first half of the coming week is looking very warm or hot in southern and central areas.

"But by Wednesday the risk of thunderstorms increases.

Crowds flocked to the beach at Scarborough south bay
(Image: Peter Harbour – North Yorkshire Live)

"The heat builds in the southern half of the country on Wednesday and temperatures could reach 32C (90F) locally."

The website adds: "As the day progresses there will be an increasing risk of thunderstorms in the south.

"The northern has more cloud and lower temperatures. In the north west there could be patchy spells of rain.

"During the rest of the week changeable and cooler conditions spread southeastwards across all areas."

Paul Michaelwaite, forecasting for Netweather TV, said: "Cooler weather starts to move down from the northwest by Monday

Paddleboarders cool off in the sea off of Hastings beach in East Sussex
(Image: PA)

"That won't be the end of the road for the hotter weather though, with the southern, central and particularly the southeastern quarter of the UK seeing more of it, particularly on Monday and again on Wednesday.”

Tomorrow he said there's was going to be a “real temperature contrast, as the south and southeast keep the heat and sunshine for much of the day.

"London may reach 30C or so, although with the front moving ever closer, cloud may increase enough in the afternoon just to suppress temperatures a little and keep the maximum in the high twenties.

"Other parts of England and Wales will have more cloud through the day [on Monday], with highs of 18-24C typically."

He said some parts of the Midlands would "see the warmesteratures during the morning before the front arrives to cool things off.

"It'll be a very different day for Scotland, with sunny spells, a scattering of showers and a keen westerly wind with highs of 13-17C generally," Mr Michaelwaite added.