It's too hot. What is so hot?

1, the weather is so hot that the whole class is listless in class.

It's so hot that people are sweating and waving their hats.

It's too hot, but he would rather let himself sweat than ask his parents to help him.

It's too hot. After lunch, it's too hot to stay. I'm going out to find a good place to enjoy the cool. I go out with an umbrella. I want to go to the nearby park and walk on the road. Although I have an umbrella, I still feel warm, just like sitting by the fire.

The weather in that place is too hot, really hot.