快晴 (Kaisei) is a Japanese noun meaning “clear weather, cloudless weather, good weather”.
Meanings
- noun, adjectival nounclear weather; cloudless weather; good weather
Examples
１０月には快晴の日が多い。
We have a lot of very fine days in October.
さっきまでの快晴がうそのようだ。
It's hard to believe it was so clear and sunny up to just now.
今日は快晴だ。これで一日中仕事が出来る。
It's fair today, so we can work all day.
Sentences from Tatoeba (CC BY 2.0 FR).