the move comes as the chinese president prepares to visit south korea, with whom the north is technically at war.
it also comes a day after japan urged pyongyang to stop such launches and after seoul rejected a north korean offer to end hostilities as insincere.
the two rockets were fired from a side near the eastern city of wonsan at 06.50 (21.50 GMT tuesday) and 08.00, south korea's joint chiefs of staff said in statement.
north korea appeared to be testing the range of the projectiles, yonhap news agency reported, citing military officials. it also carried out similar tests on 26 and 29 june.