Chairman of the London 2012 Olympics LOC Sebastian Coe fears the British weather could ruin the Olympic Games.
The Games could be one the wettest of any summer Olympics if the rain continues and the long-term forecast is for changeable conditions.
June was one of the wettest on record in the UK, with torrential rainfall causing floods in many areas around the country, and the April - June quarter was the wettest second quarter in the UK since records began in 1910.
And Coe admitted that the weather is causing logistical problems for organisers, but pledged that contingency plans are in place to deal with issues.
'This is a challenge,' he said, speaking at the first LOCOG daily briefing.
'I have joked in the past about putting a roof across the whole country, but let's be clear, this is actually proving quite a challenge to us.
'We have got waterlogged sites, resurfacing that is taking place in some areas, particularly in some of the more sensitive and rural sites, Greenwich Park and Eton Dorney.
'We're laying down a trackway and services for spectators and vehicles now and through the Games. Now we are building additional shelters for our workforce
Those attending events at rural venues have been advised by organisers LOCOG to wear wellies and Coe says the organisers are 'making sensible and prudent judgements' to keep the Games on track.