A tropical storm was barrelling towards northeastern Japan on Monday, forcing Tokyo Olympics organisers to reschedule rowing and archery that could be affected by high winds.
Tropical Storm Nepartak, packing gusts up to 108 kilometres (67 miles) per hour, was expected to make landfall Tuesday, Japan's meteorological agency said.
But the agency warned of heavy rain, wind and high waves over a wide area including the capital.
"In line with the current weather forecast, the schedule for the rowing and archery events due to take place on the 27th have already been changed," Tokyo 2020 said.
"At this time, there are no plans to change the schedule for any of the other events due to be held on Tuesday."
The Games organisers said they would keep a close eye on the forecast and activate contingency plans for bad weather "should the need arise".
Meanwhile Olympic surfing chiefs decided to take advantage of big waves whipped up by the storm at Tsurigasaki Beach, 100 kilometres (60 miles) east of Tokyo by scrapping the final day of competition. Medal events will now be crammed into Tuesday's schedule.