1Hot, referring to the weather or air temperature.
今日はとても暑いですね。
It's very hot today, isn't it.
夏の東京は暑くて湿気も多い。
Tokyo in summer is hot and humid.
暑い日はアイスクリームが食べたくなる。
On hot days I want to eat ice cream.
部屋の中が暑いので窓を開けた。
It was hot inside the room, so I opened the window.
2Passionate or burning with enthusiasm, a figurative usage; 熱い is more common in everyday speech.
選手たちの暑い戦いに観客は熱狂した。
The audience went wild over the players' passionate battle.
3Trending or drawing keen attention as a topic, an uncommon usage.
その話題は業界内で暑い注目を集めている。
That topic is drawing hot attention within the industry.