1
a rainy day
rainy 作定语放在名词前，表示“下雨的、多雨的”。
We stayed indoors on a rainy day.
我们在雨天待在室内。
下雨的；多雨的
rainiest — superlative of rainy
先理解核心含义，再看它在真实句子里的用法。
下雨的；多雨的
rainy
We stayed indoors on a rainy day.
我们在雨天待在室内。
倾盆大雨的；湿的；有阵雨的。
Pouring with rain; wet; showery
多雨的
(of weather) wet by periods of rain
Because it was a rainy day, we cancelled the picnic.
因为那是一个下雨天，我们取消了野餐。
AI contextual example
The city is famous for its rainy winters, which keep the hills green.
这座城市以多雨的冬天而闻名，这让山丘保持常绿。
AI contextual example
This year has been rainier than usual, so the river is very high.
今年比往常雨水更多，所以河流水位很高。
AI contextual example
rainy days
雨天。
WordNet
rainy 作定语放在名词前，表示“下雨的、多雨的”。
We stayed indoors on a rainy day.
我们在雨天待在室内。
表示天气多雨时可用 it is rainy；若强调此刻正在下雨，常用 it is raining。
It is rainy today, so take an umbrella.
今天多雨，带把伞吧。
rainy 的比较级是 rainier，最高级是 rainiest。
April is the rainiest month in this area.
四月是这个地区雨水最多的月份。
Not this
Last week we had a rainy weather.
Use this
Last week we had rainy weather.
weather 是不可数名词，前面不能加不定冠词 a。rainy 直接修饰 weather，表示“多雨的天气”，所以要去掉 a。
Not this
We stayed inside on the rain day.
Use this
We stayed inside on the rainy day.
表示“下雨的/多雨的”作定语时要用形容词 rainy，rain 是名词或动词，不能直接修饰 day。
Not this
We played games in a rainy day.
Use this
We played games on a rainy day.
具体指某一天（包括 rainy day）时，英语用介词 on，不用 in；这是汉语“在下雨天”直译造成的错误。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
雨季
The rainy season here lasts from June to September.
这里的雨季从六月持续到九月。
雨天
We stayed indoors because it was a rainy day.
因为是个雨天，我们待在室内。
阴雨天气
I don't mind rainy weather as long as I have a good book.
只要有好书读，我不介意阴雨天气。
下雨的下午
She spent the rainy afternoon reading by the window.
她在窗边看书度过了那个下雨的下午。
雨夜
The accident happened on a rainy night.
事故发生在一个雨夜。
多雨的气候
He prefers a rainy climate to a dry one.
比起干燥的气候，他更喜欢多雨的气候。
存钱以备不时之需；未雨绸缪
I know you want to spend the bonus, but you should save some for a rainy day.
我知道你想花掉这笔奖金，但你应该存一些以备不时之需。
应急储备金；备用金
Our rainy day fund helped us when the water heater broke.
我们的应急储备金在热水器坏了时帮了大忙。
雨天和星期一时常让我情绪低落。
She loves rainy days because they make the city feel calm.
她喜欢雨天，因为雨天让这座城市显得宁静。
佐治亚的夜晚下着雨，好像全世界都在下雨。
The picnic was canceled due to the rainy weather.
由于多雨的天气，野餐被取消了。
发长 /eɪ/ 音 (如 rain, wait)
Use rainiest naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：rain（雨）后面加 y 变成形容词 rainy，表示“有雨的、多雨的”，比如 rainy day（下雨天）。
语域：neutral 常见场景：天气预报、日常闲聊 “rainy”是描述天气的常用中性词，通常用于口语或一般书面表达，正式程度不高不低。
rainy /ˈreɪni/ 与 brainy /ˈbreɪni/、grainy /ˈɡreɪni/ 押韵（重读元音及之后均为 /eɪni/）。注意 rain /reɪn/ 和 raining /ˈreɪnɪŋ/ 拼写相近但不押韵；sunny /ˈsʌni/、tiny /ˈtaɪni/ 虽也以 /ni/ 结尾，但重读元音不同，不是完全押韵。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.