What's the weather like in Beijing in mid-September?

Autumn is thick, and the sun doesn't shine. You can check the historical weather in Beijing in previous years. There is information on the internet.

Dressing is: trousers in the morning and evening, short sleeves at noon.

The temperature is comfortable, but long clothes and trousers are still needed.

Just like ordinary high school uniforms, the three-piece suit is just right (pants, long-sleeved tops and short-sleeved tops).