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Thunderstorms could put a dampener on performances by the likes of Queen, Alicia Keys and Diana Ross at this weekend's Jubilee concert at Buckingham Palace.
People celebrating in central London have so far enjoyed warm and dry weather, but the Met Office is considering putting out a weather warning for Saturday.
Heavy and possibly thundery showers are likely in southern England in the evening and could stretch into Sunday.
"Southern areas are likely to see a spell of showers on Saturday and Sunday, which could turn heavy and thundery at times," said Met Office deputy chief meteorologist Rebekah Sherwin.
"However, there will also be some breaks in the cloud even here, and northern areas are most likely to stay fine and dry."
Simon Partridge, also from the Met Office, said there wasn't yet enough confidence to issue a warning but it would be reviewed on Friday "simply because of the number of people we're expecting in the capital on Saturday night".
Ten thousand free tickets have been issued for the Platinum Party At The Palace on Saturday, which will be broadcast on the BBC from 7.30pm.
Sir David Attenborough, Emma Raducanu, David Beckham and Stephen Fry will also make appearances, and there will be a recorded performance from Sir Elton John.
Friday is forecast to be the warmest day of the four-day Jubilee, with temperatures of 25C (77F) in the south on Friday.
Later in the weekend the highest temperatures are expected to be in the North West.