4 sentences for 陰 (yīn — cloudy)

1. 天阴了，好像要下雨了。

   tiān yīn le, hǎo​xiàng yào xià​yǔ le.

   The sky has turned grey; it looks like it's going to rain.

   Source: Dong Chinese Dictionary

2. 天气一会儿晴，一会儿阴。

   tiān​qì yī​huì​r qíng, yī​huì​r yīn.

   The weather is sunny one moment and cloudy the next.

   Source: Dong Chinese Dictionary

3. 阴转多云。

   yīn zhuǎn duō​yún.

   Overcast turning to cloudy.

   Source: Dong Chinese Dictionary

4. 天空阴得厉害，看样子下午出门得带把雨伞。

   tiān​kōng yīn de lì​hai, kàn​yàng​zi xià​wǔ chū​mén děi dài bǎ yǔ​sǎn.

   The sky is very overcast; it looks like I'll need to take an umbrella when I go out this afternoon.

   Source: Dong Chinese Dictionary