Competitors' skimpy outfits - particularly in the women's event - have made it a perennial favourite among fans, and the event at the iconic Horseguards Parade in central London was set to be perhaps the most glamorous at London 2012.
But competitors will be swapping their bikins and thongs for leggings and pullovers thanks to the cold temperatures and driving rain that has dogged the country for weeks on end.
"Once the temperature drops below 16C we are allowed to wear long leggings and long-sleeved tops," said Britain's Shauna Mullin, who will be competing alongside the appropriately-named Zara Dampney.
London temperatures have been below 16 degrees every day so far in July, according to a report in the Sunday Times, which will mean competitors will almost certainly be forced to cover up unless things warm up.
The paper also predicts that tickets for the event - which, unsurprisingly, were among the first to sell out - are set to go back onto the market in their hundreds.