Why is the Olympic Games in the heat of the heat at this time of year?

Tokyo, where the Olympics are held, is currently experiencing a midsummer day of over 30 degrees Celsius and a hot day of over 35 degrees Celsius. The last Tokyo Summer Olympics held in 1964 was held in October, which is cooler than this time. Why was the Olympics held at this time of the year, with concerns that the high summer temperatures and humidity in Tokyo could endanger athletes? Mariko Oi, a BBC reporter, explains why. Click here for articles on the BBC News site. https://www.bbc.com/japanese/video-57993696 Click here to subscribe to the BBC channel on YouTube. http://goo.gl/tYDMwU Click here for Japanese Twitter on BBC News. https://twitter.com/bbcnewsjapan.