A woman makes her way through the strong wind and rain in Miyazaki, southern Japan. AP

The powerful system has weakened since arriving on land Sunday evening around Kagoshima city in the southwestern region of Kyushu, but it has still uprooted trees, smashed windows and left rivers close to overflowing.

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National broadcaster NHK said one person had been killed and 50 others injured as the storm passed through Kyushu. There was no immediate confirmation of the figures from authorities.

Prime Minister Fumio Kishida, who had been scheduled to leave Monday for the United Nations General Assembly, will delay his trip by a day to check on damage from the storm, his office confirmed.

Rescuers conduct a search operation at the site of a landslide in Mimata, Miyazaki Prefecture, Japan, on Monday. AP

Officials from the Japan Meteorological Agency warned that in Miyazaki prefecture, where some areas saw more rainfall in 24 hours than they normally receive in all of September, river levels were high.

"Even a tiny amount of additional rainfall could cause the water level to increase, so please remain vigilant about flooding and landslides," Yoshiyuki Toyoguchi from the land ministry told reporters.

Still, given the intensity of the storm, which came ashore packing gusts of up to 234 kilometres (145 miles) an hour, damage appeared relatively limited so far.

"The typhoon has all but disappeared today and the rain and wind are also subsiding now," an official in charge of crisis management in Miyazaki's Saito city told AFP.

"But power is out in some places... we're also hearing from many residents that electrical wires have been severed and trees have been toppled," he said, declining to be named.

A car passes a fallen tree in the wake of Typhoon Nanmadol in Izumi, Kagoshima prefecture on Monday. AFP

"Flooding is affecting some areas as well," he added, saying that officials "believe there are still many details of the damage we're yet to grasp".

Rare "special warnings" for Kagoshima and Miyazaki prefectures, issued only when weather events seen every few decades are forecast, have been downgraded.

But evacuation warnings of various levels remained in place for 9.6 million people on the last day of a holiday weekend in Japan.

The warnings are not mandatory, and authorities have at times struggled to convince residents to leave their homes during extreme weather events.

Agence France-Presse