But with only a 10% chance of rain in the morning, here's hoping it stays dry for Kate's grand appearance at Westminster Abbey!
MEDIAWATCH: More than 8,500 members of the world's media have descended on London in a clear sign the royal couple have captured the world's imagination
US broadcaster CNN is starting its coverage at 4am in East Coast America, while Buckingham Palace has agreed to stay lit up until 12.30am for the benefit of its American audience
UPDATE: Syrian ambassador Sami Khiyami has described the withdrawal of his royal wedding invite as "embarrassing" but added that it was unlikely to jeopardise any "ongoing relations and discussions with the British Government"
THE KNOWLEDGE: Prince William and Kate are due to make their first journey as husband and wife from Westminster Abbey to Buckingham Palace in the 1902 State Landau that was used by Charles and Diana on their wedding day. But if the heavens open as predicted, they'll use the standby option of the Glass Coach. Very fitting for a fairytale wedding
Those hoping for a sneaky peek at Kate's dress will be disappointed - a canopy has been erected over the front of The Goring hotel to avert prying eyes
Comedian Eric Idle was among those offering Prince William some sage advice: "Is there anything to look forward to in becoming a married man? You can be in the wrong all the time, that's a thing he can look forward to"
Alternatively, hard copies will be available on the day for £2 at locations in Green Park, Hyde Park, St James’s Park and Trafalgar Square
Shops in the West End look set to be quids in thanks to the royal wedding effect - half a million extra shoppers are expected to hit Oxford Street et al over the four-day bank holiday weekend, with analysts predicting a £50 million splurge. Ker-ching!
Chaotic scenes outside Westminster Abbey as the growing makeshift tent village brought traffic - and pedestrians - to a standstill. Police officers formed a pedestrian walkway on the main road using metal barriers
A Metropolitan Police officer said camera crews in front of the tents had caused blockages on the road so they had used barricades to "separate the people from the traffic to keep everyone safe"
Looks like Britain has gone bonkers for bunting - internet retailer Ocado has sold out after selling more than 3,000 yards - nearly two miles - of the stuff in the last week
The Duchess left Clarence House and took a stroll over to the famous thoroughfare which runs the other side of her garden wall to chat to some of the hardy royalists who are sleeping on the streets
While chatting to the crowds one spectator asked her how she was feeling and the Duchess replied: "We're all ready for tomorrow, it's wonderful and we're all very excited"
She added: "It's such a great atmosphere here. It's so nice to meet people and see the celebrations are getting under way"