晴はれ上あがる

godan verb (-ru), intransitive verb

clear up; become completely clear

Describes the sky or weather becoming perfectly clear, often after rain or clouds. Emphasizes a bright, cloudless state.

• 雨あめがやんで、空そらが晴はれ上あがった。

  The rain stopped and the sky cleared up completely.

• 朝あさにはすっかり晴はれ上あがるだろう。

  It will probably clear up completely by morning.