Kansai International Airport in Osaka Prefecture closed its runways from 11 a.m. on September 30, suspending 330 flights.
Speaking from a hotel near the airport, British businessman Richard Swart said: "It's actually quite warm outside, very windy and with very heavy rain".
Packing maximum gusts of 216 kilometres (134 miles) per hour near its centre, Trami was forecast to hit the mainland later Sunday and travel over most of the archipelago, causing extreme weather into Monday, forecasters said.
Many flights and trains services were cancelled as the storm moved eastward.
Strong winds and torrential rain stopped transport completely.
Kansai International Airport in Osaka, western Japan, which was heavily flooded by a typhoon last month, said it had closed its runways from 11am (02:00 GMT) on Sunday until 6am on Monday.
A pedestrian holds his broken umbrella a s he walks against a strong wind after Typhoon Trami hit the city of Kagoshima, on Kyushu island, on September 30, 2018.
Typhoon Trami was the equivalent of Category 2 hurricane when it passed over the Ryukyu Islands late Friday. The airport only fully reopened on September 21 following previous storms.
Even from the safety of the hotel, he said he could hear the wind "howling" outside.
Japan's weather agency has issued warnings of landslides and flooding from possible storm surges.
Cities in the expected path of the typhoon were already taking precautions.
West Japan Railway was to suspend local train services in Kyoto, Osaka and Kobe districts from Sunday morning, and the Shinkansen bullet train was also to be halted.
Tokyo Electric Power Company said more than 510,000 homes were without power in the Kanto-Koshinetsu region, according to NHK.
The island's main carrier, China Air Lines (CAL), was canceling Sunday's flights CI156/157 and CI172/173 between Taiwan Taoyuan International Airport and Kansai, flights CI166/167 between Kaohsiung and Kansai, and flights 178/179 between Taoyuan and Takamatsu, according to the Apple Daily.
Deadly record rainfall hit western Japan earlier this year, killing over 200 people, and the country also sweltered through one of the hottest summers on record.
Hokkaido is reeling from a magnitude-6.7 quake in early September that killed more than 40 people.