Why does it rain in hot summer, and the seniors feel particularly sultry?

Because the air humidity is high before it rains.

When it rains, the clouds are low and cover the air like a quilt. If the heat and moisture in the air cannot be released, the air will be sultry. In addition, people's sweat can't evaporate in time, and sweat can't spread out of the body quickly, so it feels particularly stuffy.

Because of the rich water vapor and high air humidity in summer, when the temperature is not too high (relatively speaking), people feel sultry, just like in a steamer. Such weather is called sultry and high temperature. Because people like to take a sauna in this weather, it is also called "sauna day". It often appears in China's coastal areas, the middle and lower reaches of the Yangtze River and South China.

Extended data:

When the actual temperature is 29-32℃, if the air humidity is high, the interaction of high temperature and high humidity will make people feel as if it is 38℃ or even 42℃.

High air humidity will make hot weather more uncomfortable, mainly because the human body cools down through sweating and evaporation. When the air humidity is high, the evaporation of sweat in the human body will slow down and the body will feel very hot. Just like a car without a water tank to dissipate heat, all the heat is trapped inside.

People's Network-Why is Hangzhou so sultry these two days?