We may be heading for a heatwave this week but there is a risk of showers for London on the day of the Olympic opening ceremony.
While director Danny Boyle's ambitious plans for the opening ceremony include clouds that will rain down over the stadium in Stratford, east London, fingers had been crossed that the much-anticipated event would otherwise stay dry.
After weeks of wet weather the outlook has brightened for the coming week.
The mercury is set to rise to 29C or even 30C tomorrow, and will stay in the high 20s for the rest of the week, but forecasters said temperatures are set to fall again by Friday.
Billy Payne, a forecaster with MeteoGroup, said:
Widespread flooding, the wettest period of April to June on record and more heavy rain so far this month have been caused by the jet stream settling unusually far south.
But forecasters said it is on its way back north, leading to more traditional summer weather this week.
Bookies have been taking bets on what the next few weeks will bring, with William Hill offering odds of 3/1 that it is raining during the opening ceremony and 66/1 that the Olympic flame is extinguished while the last person carries it into the stadium.
They are also offering 12/1 that a temperature of more than 100F (38C) will be registered in the UK while the Games are taking place.