The Meteorological Agency has announced the start of the rainy season in Tokyo and surrounding areas including parts of central Japan.
A weather front and low-pressure system brought rain mainly along the Pacific coast from western to eastern Japan on Monday.
Agency officials announced that the annual rainy season appeared to be underway in Tokyo and the areas around the capital, as cloudy weather and rain are likely to continue over the next seven days.
If the announcement is formally confirmed, it will be the first time since 2005 the agency has announced the start of the rainy season in such areas, ahead of the southern Kyushu and Shikoku regions in western Japan.
Weather officials are predicting more rain through Tuesday in the southwestern prefecture of Okinawa, and the northeastern region of Tohoku.
Officials are calling for caution against mudslides, floods and swollen rivers.