A Japanese government survey shows that the country's exports declined 19.2 percent in July from a year earlier.
The Finance Ministry released the preliminary trade data on Wednesday.
Japan's agricultural ministry has warned of devastating damage to the farming, forestry and fisheries industries due to ongoing torrential downpours.
The ministry says as of 11 p.m. on Friday, damage has been confirmed in 30 prefectures. They include Kumamoto and Kagoshima in the southwestern Kyushu region, which has been hit particularly hard by the extreme weather.
Japanese municipalities and health officials confirmed 110 new cases of coronavirus infection across Japan on Monday, bringing the total to 18,631.
With the 712 cases from the Diamond Princess cruise ship that was quarantined at Yokohama port added, the total number of confirmed infections comes to 19,343.
Sources close to the Tokyo Metropolitan Government have told NHK that 118 new cases of coronavirus infections were confirmed on Saturday.
It is the first time for the daily tally to surpass 100 in Japan's capital. Tokyo's cumulative total now stands at 891.