夜よ上あがり

noun

weather clearing at night

Refers to the sky clearing up after rain or clouds during the evening or nighttime. Often used in weather forecasts or descriptive writing.

• 今こん夜やは夜よ上あがりで、星ほしがよく見みえるでしょう。

  Tonight the weather will clear up at night, so the stars should be clearly visible.