What is the weather like in Yinchuan? I don't know what clothes to bring to work there.

The weather is not bad. Generally, the temperature is around 20°C to 33 C. You can choose to bring some light and comfortable short sleeves and prepare some long sleeves to avoid catching cold when it rains. If the time is short and it happens to be summer, summer will generally not be very different, so just choose what you wear now. If you want to spend the winter, you should be prepared for the cold.