LONDON, ENGLAND - AUGUST 31: A visitor and member of staff take showers at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - AUGUST 31: A visitor and member of staff take showers at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - AUGUST 31: Women relax on the grass as they at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)

*** BESTPIX *** LONDON, ENGLAND - AUGUST 30: A commuter takes a photo on his phone of two hot air balloons flying over Tower Bridge on the River Thames as dawn breaks and the sun rises over the British capital city on August 30, 2016 in London, England. The south east of England has recently seen consistent hot and dry weather with temperatures often exceeding 30 degrees celsius. The dry weather with good visability and low wind speeds makes it ideal for hot air balloon flights. (Photo by Chris J Ratcliffe/Getty Images)

This August 30, 2016 NASA satellite image shows Hurricane Gaston in the Atlantic Ocean. Gaston, was downgraded to a Category Two storm, US weather trackers said. A Category Three hurricane earlier on August 29, Gaston was the first major hurricane of the Atlantic season. The storm was packing top sustained winds of 105 miles per hour as of 0300 GMT Tuesday, around 600 miles east of Bermuda, the Miami-based National Hurricane Center said. / AFP PHOTO / NASA / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NASA" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

LONDON, ENGLAND - AUGUST 30: A commuter walks over the Millenium Bridge whilst checking his phone as dawn breaks and the sun rises over the British capital city on August 30, 2016 in London, England. The south east of England has recently seen consistent hot and dry weather with temperatures often exceeding 30 degrees Celsius. The dry weather with good visibility and low wind speeds makes it ideal for hot air balloon flights. (Photo by Chris J Ratcliffe/Getty Images)

LONDON, ENGLAND - AUGUST 30: A seagull screeches with Tower Bridge behind as dawn breaks and the sun rises over the British capital city on August 30, 2016 in London, England. The south east of England has recently seen consistent hot and dry weather with temperatures often exceeding 30 degrees Celsius. The dry weather with good visibility and low wind speeds makes it ideal for hot air balloon flights. (Photo by Chris J Ratcliffe/Getty Images)

LONDON, ENGLAND - AUGUST 30: Two hot air balloons fly over central London and past cranes that dominate the skyline as dawn breaks and the sun rises over the British capital city on August 30, 2016 in London, England. The south east of England has recently seen consistent hot and dry weather with temperatures often exceeding 30 degrees Celsius. The dry weather with good visibility and low wind speeds makes it ideal for hot air balloon flights. (Photo by Chris J Ratcliffe/Getty Images)