But it did little to affect the atmosphere for those watching the river pageant in the capital or attending the 10,000 street parties held across the nation.
And for the thousands heading into London tonight for the jubilee concert at Buckingham Palace, there could just be a break in the clouds.
Downpour chic: Waterproof ponchos were the must-have garment at yesterday's Thames pageant, but luckily there's a brighter outlook for tonight's concert
Instead of singing in the rain, forecasters predict that they will enjoy a dry and sunny evening. Matt Dobson, a forecaster with Meteogroup, said: ‘It’s not looking too bad at all.
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‘It was pretty miserable in London for the pageant along the Thames, especially for those who decided to camp out overnight. We saw up to an inch of rain fall quite widely across England and Wales, spreading from London up to the Midlands and into Wales and the South-East.
‘But the rain is moving eastwards which will make way for sunny intervals and the odd shower here and there.
‘It’s certainly going to be an improvement and for those attending the jubilee concert it’s going to be a dry, sunny and cool evening at the Palace.
Welly tots: Nine-month-old William Nelson Smith (left) enjoys the gigantic street party held by the villages of Goring and Streatley in Oxfordshire, while Leilah Palmer, three, keeps the rain off in Hyde Park, London
Just getting on with it: Umbrellas and emergency plastic ponchos helped keep the party alive despite the downpour, as thousands attended Jubilee parties up and down the country
‘In fact, some of the best weather will be around on Monday afternoon.’
The wet weather will, however, return by tomorrow. A new band of rain is expected to move in from the West, spreading further east through the day.
Nevertheless, forecasters expect London to remain pretty much unscathed by it.
Temperatures are even expected to rise to 15c (59f) in time for tomorrow’s service of thanksgiving at St Paul’s Cathedral, receptions in the City and lunch at Westminster Hall for senior royals, and a carriage procession to the Palace.
On Wednesday, as the country returns to work, the weather shows no sign of improving, with widespread heavy showers expected, accompanied by the added risk of thunder.
The bout of rain and below-average temperatures is in stark contrast to the Mediterranean sunshine and record 28c (82f) heat that bathed most of the country last weekend.
‘The change in the weather has been incredible,’ said Mr Dobson. ‘Last week there was barely a cloud in the sky anywhere in the country.’
Dressed for the occasion: These wellington boots proved a practical and patriotic choice for pageant spectators near London's Tower Bridge
Save our scones: Plastic sheeting forms a makeshift shelter for party guests in Oxfordshire as the rain lashes down
Determined: Three young revellers on the banks of the Thames brace themselves against the dismal weather with hot drinks and waterproofs