天気雨
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Meanings
1
sun shower; sudden rain from a blue sky
Refers to rain falling while the sun is shining, often with no visible clouds. Sometimes associated with the folkloric expression 狐の嫁入り (kitsune no yomeiri, 'fox's wedding').
See also: 狐の嫁入り
A sun shower started, so a rainbow might appear.
It feels strange when it rains while the sun is out.