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暑いので

because it's hot

→ 暑い
phrase Rare #22,286
because it's hot ので means “because” or “since” and gives a reason in a relatively polite or soft way. 暑い refers to hot weather or a hot environment; for hot food or objects, 熱い is usually used instead.
JA: 今日は暑いので、窓を開けました。
EN: Because it's hot today, I opened the window.

あまり暑いので働けない。

It's too hot to work.

その食べ物は暑いので腐ってしまった。

That food spoiled because it was hot.

今日はとても暑いので勉強する気になれない。

It's so hot today that I don't feel like studying.

少し暑いので、窓を開けます。

It's a little hot, so I'll open the window.