天不作美 The weather is not cooperating
Explanation
指天公不帮忙，事情无法顺利进行。通常指因为天气原因导致计划受阻。
Refers to unfavorable weather conditions that prevent or hinder a planned activity.
Origin Story
老张计划周末带家人去郊外爬山，他兴致勃勃地准备了登山装备和午餐。然而，天公不作美，一大早便下起了倾盆大雨，山路泥泞不堪。无奈之下，老张只好取消了登山计划，一家子只能待在家里，看着窗外的大雨，心里多少有些失落。老张安慰家人说，下次天气好的时候，我们再去爬山，这次就当是休息调整吧。
Old Zhang planned to take his family for a mountain climbing trip in the suburbs on the weekend. He excitedly prepared the mountaineering equipment and lunch. However, the weather was not cooperative, and a heavy rain started pouring down early in the morning, making the mountain path muddy and impassable. With no choice, Old Zhang had to cancel the climbing plan, and the family could only stay at home, looking at the heavy rain outside the window, feeling somewhat disappointed. Old Zhang comforted his family, saying that they would go mountain climbing again next time when the weather was nice, and this time they could just take it as a rest.
Usage
多用于口语，表达因天气原因导致计划无法顺利进行的遗憾。
Mostly used in colloquial contexts to express regret that a plan could not proceed smoothly due to weather conditions.
Examples
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秋游计划因为天不作美而取消了。
qiuyu jihua yinwei tian bu zuo mei er quxiaole.
The autumn outing was cancelled because of bad weather.
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婚礼本该在户外举行，可惜天不作美，下起了大雨。
hunli ben gai zai huwai juxing, kesi tian bu zuo mei, xia le dayu。
The wedding was supposed to be held outdoors, but unfortunately, it rained and ruined everything.