Tokyo 2020 chiefs have been testing misting sprays and air-conditioned tents to combat soaring temperatures.
Last year a heatwave in the city killed more than a dozen people and on Thursday organisers tested ways to keep people cool at an international volleyball event - in case temperatures soar at next year's Games.
With one year to go, 150 volunteers queued to trial the cooling measures.
Supporters were also given fans and towels to keep them cool.
"We cannot control the climate. We must deal with it based on facts and reality," Tokyo 2020 Games delivery officer Hidemasa Nakamura said.
"Even creating shadows or mist, it's difficult to cover the entire area."
Fire engine-sized misting stations pumping out sprays of water, air-conditioned cooling tents and potted flower fences that organisers say help "psychologically" cool those around were trialled and Tokyo 2020 organisers will employ wet bulb globe temperature (WBGT) measuring devices at all venues.
Ken Wakabayashi, an environment official at the Tokyo Metropolitan Government said: "It all depends on a situation, but for the spectators, we will prepare cooling facilities and goods for them.