这几天都在下雨。

Using this phrase is super simple. You can say it as a standalone sentence. Or you can add it to a reason. For example, explain why you stayed home. Just say the phrase and sigh a little. The structure 都在 (dōu zài) shows a continuous state. It makes you sound like a native speaker. It is much better than just saying 'it is raining.' It tells a story of your recent struggle with umbrellas.

Use it when making small talk with neighbors. It works great at the start of a meeting. It breaks the ice perfectly. Use it when texting a friend to cancel plans. It is a valid excuse for being lazy. Use it when you see someone with a wet jacket. It shows you sympathize with their damp situation. It is a very safe, polite topic for any conversation.

Don't use it if it only rained for five minutes. That would be an exaggeration. Avoid it in super dry desert climates unless you want to sound sarcastic. Don't use it if you are talking about the future. This phrase is strictly for the recent past and the present. If you are at a funeral, maybe pick a more serious topic. Unless the rain is making the cemetery particularly muddy.

In China, weather is a classic 'safe' conversation starter. It is similar to how people talk in the UK. In southern China, there is a 'Plum Rain' season. During this time, you will hear this phrase every single day. People use it to bond over shared annoyance. It is a way to connect without being too personal. It bridges the gap between strangers. It is the ultimate social lubricant.

If it's just starting, say 要下雨了 (yào xià yǔ le). If the rain is incredibly heavy, add 大 (dà). You would say 这几天都在下大雨. If you want to be more casual, just say 老是在下雨 (lǎo shì zài xià yǔ). This means 'it's always raining.' It sounds a bit more annoyed. If you are feeling poetic, you can say 阴雨连绵 (yīn yǔ lián mián). But keep that for your diary or a love letter.