The 15-member IOC Executive Board is meeting from July 18-20 with a full agenda, including the Winter Olympic program as one of the main topics.
The 2020 Olympics will run from July 24 to August 9, when temperatures in central Tokyo can exceed 35C.
"I believe the Tokyo 2020 Games will generate more enthusiasm than ever".
"If this is what it's going to be like for the Olympics, it will be unsafe", said office worker Akira Nishino as he mopped sweat from his brow near the Imperial Palace on Friday.
Japan is now experiencing a heatwave that has left over a dozen people dead and hospitalised thousands, leading to fears of similar problems when the Olympics rolls into town in two years' time.
In an attempt to cut organizing costs, amid recent failures of potential bidders in Europe for the 2026 Winter Games, there should be no additional venues required and 41 fewer athletes in Beijing than the 2,933 competitors at the Pyeongchang Olympics last February.
"We are mindful that we do have to prepare for extreme heat", he said at a news conference.
Boxing could still be axed from the 2020 Olympics in Tokyo after the IOC admitted Thursday that concerns remain over the sport's governance and management by the International Boxing Federation (AIBA).
Mr Coates has urged Tokyo organisers to rely more heavily on foreign expertise in staging events where Japan does not have a strong background.
At April's SportAccord Convention in Bangkok, organizers faced criticism from federations over issues such as competition planning, water pollution and communications.
"Obviously in sports in which Japan is not traditionally strong, and doesn't have a lot of experience in, then more liaison work with worldwide federations is necessary", Kyodo News quoted Coates as saying.