When the shortlist was announced, just before the Games began in July, judges described the Olympic Stadium in Stratford as having "a spirit of fun".
They said the architects had "designed a space to create an amazing atmosphere, where every seat has a great view".
More top news
Temperatures soared to 27.9C in Northolt shortly after midday on Thursday, making it the warmest April day for 69 years.
The South East will enjoy the best of the weather and along with Paris will be the hottest place in Europe.
The Foreign Secretary insisted police had to "come down like a ton of bricks" on gang leaders as he warned against "going soft".