Officials in Tokyo confirmed 4,220 new cases of coronavirus on Tuesday, bringing the total number of infections in August to 100,961.
It's the first time a monthly tally has topped 100,000.
The total number of coronavirus cases confirmed in the capital now stands at 318,929.
Tuesday's tally is down 157 from a week ago.
The seven-day average through Tuesday is 4,636.9, up 2.4 percent from a week ago.
There are 268 patients in serious condition, down four from Monday.