for a morning rain leave not your trip.
不要因?yàn)樵绯肯铝艘粓?chǎng)雨就不去旅行。

when dew is on the grass,rain will never come to pass.
"草上露珠閃，告別下雨天

fish bite best before a rain.
大魚(yú)吃小魚(yú)，天空要下魚(yú)

when ladybugs swarm,expect a day that’s warm.
螞蟻搬家，天將雨

if bees stay at home,rain will soon they fiy away ,fine will be the day
蜜蜂遲歸，雨來(lái)風(fēng)吹

on cloud nine
飄飄然如上九重天

halo around the sun or moon ,rain or snowsoon.
日暈三更雨，月暈午時(shí)風(fēng)

when a halo rings around the moon or sun, rain is approaching on the run.
太陽(yáng)月亮鑲銀邊，老天馬上要下雨

red sky at night, sailor’s sky in the morning, sailor’s warning.
"晚上天色紅，水手樂(lè)呵呵；早晨天色紅，水手急煞煞。

save for a rainy day
未雨綢繆

when the stars begin to huddle ,the earth will soon become a puddle.
月明星稀

mountains in the morning. fountains in the evening.
"早晨天上積雨云， 晚上地下降暴雨

red sky at night,sailor’s sky in the morning,sailor take waring.
早霞不出門(mén)，晚霞行千里?