Games officials have flagged the option of rearranging the schedule should a tropical storm develop - the possibility of which was rated as a "medium chance" by meteorologists on Saturday.

If a storm arrives by Monday, organisers would be forced to postpone that day's men's cross country mountain biking event, and the women's event on Tuesday.

"We were here for the test event in 2019 and the course didn't hold up that well with only such a small amount of rain," Rebecca McConnell said.

"The weather is going to play a huge part - if it rains it will be hugely challenging and that would add another element.

"We came here expecting a lot of rain which we haven't had yet. I think at the moment it's very dusty but it could change quite quickly and there's a lot of sections that will become quite dangerous when the wet mud goes onto the rocks and then it becomes super slippery.

"It's just a matter of making sure you have the right equipment and that you're mentally ready whatever happens with the course."

Olympics organisers have already pre-emptively moved rowing events scheduled on Monday forward to this weekend.

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"You have to have a very close look at the schedule. See when you can resume competition that can be affected or not," Olympic Games executive director Christophe Dubi said.

"The technology we have from the Japanese Meterological Agency to see what is coming up is a very big plus. This was anticipated, which is a good thing, so it was not that day or that minute that you have to make the call.

Dubi also addressed the issue of mask-wearing at the Olympics during a press briefing on Saturday, saying action would be taken against those who blatantly disregard face coverings.

The Kyrgyzstan and Tajikistan teams paraded mostly without masks at the Games opening ceremony on Friday night, marking an awkward contrast with other national teams who covered their faces in line with COVID-19 protocols.

"I say it every time we start a meeting and see someone not wearing mask - it's our duty to say 'Mask please'," Dubi said. "It is very important. We must be on message to tell people to socially distance and wear the mask. If you have blatant behaviours that are absolutely unbearable then we will definitely take action."