Tennis matches at the Ariake Tennis Park will begin from 3pm local time (0600 GMT) from Thursday, governing body International Tennis Federation said after requests from players who had struggled in the stifling weather.
Serena Williams again wore her distinctive single-legged leotard for her second match at the Australian Open on Wednesday, and said the light material was perfect for the warmer conditions if a little too sheer to wear by itself.
Novak Djokovic was unexpectedly beaten by fifth-ranked Alexander Zverev, quashing his hopes of winning an Olympic singles gold medal, the only major honour missing from his long list of accolades.
Serena Williams showed glimpses of what lies in store for rivals this season
Kim Clijsters and Venus Williams fell at the first hurdle
The world number one had arrived in Tokyo aiming to become the first man to win all four majors and an Olympic gold medal in the same calendar year. But that quest came to an end after he was beaten by fifth-ranked German Alexander Zverev in Friday's semi-final.
Images from Day 2 of the Wimbledon tennis championships in London, on Tuesday.
A summary of Wednesday's action at the US Open.
Images from Day 1 at the Australian Open.
Images from Day 3 of the Australian Open in Melbourne on Wednesday.