Princess Mako, the eldest granddaughter of Emperor Akihito, and her longtime boyfriend, Kei Komuro, will speak to the press together on Sept. 3 to officially announce their engagement, the Imperial Household Agency said Thursday.

The announcement had originally been planned for July 8 but the couple decided to postpone it in the wake of damaging rains that lashed southwestern prefectures earlier in the month.

Earlier this month, the agency proposed that the princess and Komuro set another date for the announcement, according to the agency.