夏なつめく

godan verb (-ku), intransitive verb

become summer-like; feel like summer

Describes the weather, atmosphere, or scenery taking on a summery quality. Often used when the season is transitioning into summer.

• 5月がつに入はいって、だんだん夏なつめいてきた。

  Since May began, it has gradually become summer-like.

• 空そらが高たかくて、すっかり夏なつめいている。

  The sky is high and it feels completely like summer.