未雨绸缪- Save for a rainy day.

不雨则以，一雨惊人- It never rains but it pours.

纯洁无辜- white as snow.

泛泛之交- fair-weather friend.

不要因为早晨下了一场雨就不去旅行- for a morning rain leave not your trip.

草上露珠闪，告别下雨天- when dew is on the grass, rain will never come to pass.

On a good day, the wind lasts long on a rainy day.

An autumn rain a cold, ten autumn rain wear cotton.

First under the cow hair no heavy rain, after the cow hair is not sunny.

The bees return late, the rain comes and the wind blows.

It will rain when salty things return.

Clouds in the east, rain is not fierce；

早霞不出门，晚霞行千里- Red sky at night, sailor’s delight.

Red sky in the morning, sailor take warning.

日晕三更雨，月晕午时风- Halo around the sun or moon, rain or snow soon.

月明星稀- When the stars begin to huddle.

天色亮一亮，河水涨一丈- It was a bright light, the river rose ten feet.

红云变黑云，必有大雨淋- Red cloud nigrescence cloud, there is rain on.

天上豆英云，地上晒死人- Heavenly heart beans, ground in the dead.

日落乌云涨，半夜听雨响- Sunset brings dark clouds, and thunder is heard at midnight.

这些谚语不仅丰富了英语表达，还蕴含了丰富的文化智慧，帮助人们更好地理解和预测天气变化。