Pi AIによる
Based on the provided information, it seems like you may be feeling calm and relaxed on this pleasant sunny day with moderate temperature and humidity. Here are three J-Pop songs that reflect these feelings, each by a different artist:
"Hatsukoi" (初恋) by Hikaru Utada
"Dareka no Negai ga Kanau Koro" (誰かの願いが叶うころ) by Aimer
"Koi" (恋) by Gen Hoshino

You're right. My apologies for the mistake. Here's another song by Aimer that would fit your predicted mood:
"Kataomoi" (片思い) by Aimer