Has anyone told Mother Nature it’s the Queen’s Platinum Jubilee celebration weekend? (Picture: Getty Images/Met Office)

Bad news folks, there’s a chance our plans to glug Pimms and burn sausages on the BBQ on Sunday could be scuppered by classic poor British weather.

More than 10 million people are expected to be out in force at Big Jubilee Lunches for the Queen’s Platinum Jubilee celebration.

But remember to bring along your brolly and raincoat as the Met Office has warned that torrential downpours could bring the four-day weekend to a close.

Meteorologist Annie Shuttleworth told Metro.co.uk the situation is still uncertain – but refused to rule out another yellow warning being issued.

Southern England is set to see the worst of it, with a risk of heavy showers and possible thunder.

Temperatures will remain as high as 17°C but persistent rain will make it feel more than 12°C.

There is hope for some street parties yet though as the sun could push into southwestern areas by the afternoon.

Meanwhile, parts of northwestern Scotland will get the best of the weather, with highs of 21°C expected.

People are caught in heavy downpours on Westminster Bridge ahead of celebrations (Picture: Amer Ghazzal/REX/Shutterstock)

It’s not looking good for south England on Sunday at the moment (Picture: Faye Oakwell MET)

The Platinum Jubilee Pageant – which will feature 10,000 members of the military, volunteers, performers, key workers and members of the public – is planned in London on Sunday.

Ms Shuttleworth has warned there is still ‘a lot of uncertainty on the extent of the rainfall’ and has advised people to keep an eye on forecasts.

She said: ‘Across southern areas, it’s going to be a cloudier and cooler picture on the whole, with a risk of seeing some showers that could be quite heavy and possibly thundery on Sunday.

‘We could see fairly torrential downpours. The risk area is everywhere south of Wales to be honest – including London, obviously.

‘There’s a chance we could see some sort of similar conditions through Sunday as we’re expecting on Friday evening or Saturday morning.

‘Because of uncertainty, it doesn’t warrant a weather warning at this stage, but that’s a situation that could also evolve over tomorrow.

‘At this stage, it seems this evening is where we’ve got the greatest risk of seeing thunderstorms and those potential downpours. So that’s why there’s a yellow warning in force tonight.’

But she went on to say: ‘There’s definitely a threat of some quite heavy rain on Sunday, but with the nature of showers, it’s not to say it would last all day necessarily.

Royal fans are planning to be out in force at street parties on Sunday (Picture: AFP via Getty Images)

‘So there could be some brighter and warmer periods and drier periods in. 

‘That’s why people need to keep up to date with the story through the next couple of days, when we get a bit more certainty on the situation on timings.’

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Queen Elizabeth II’s Platinum Jubilee 2022