Hot
い adjective
あつい
暑すぎてとけそう。
It's so hot I'm about to melt.
日本では、このところ暑い日がつづいています。
It has been hot these days in Japan.
クソ暑いし蒸し蒸しするしたまんねぇな！この暑さでは寝られないよ。プールに行こうぜ！
It’s too hot and humid! I can’t sleep in this heat. Let’s go to the pool!
This is the adjective form of hot... but we're going to call it hot weather. Why? Because there's a difference between something that's hot and the weather or atmosphere being hot. This is that kind of hot, as in..."Damn, man, it's hot out here!"
This uses the same reading as the one you learned with the kanji, so you're good to go here!