下雨天的英文是rainy day。
例句：
1、如果碰上下雨天或是严寒天气，就选择一项室内活动。
If the weather is wet or cold choose an indoor activity.
2、听上去也许很奇怪，她其实喜欢下雨天。
Strange as it may seem, she actually prefers rainy days.
3、下雨天和晴天相间而来。
Wet days alternates with fine days.
4、体育馆下雨天时，学生们在体育馆内玩游戏。
On rainy days the students play games in the gym.
5、下雨天，我把伞落在家了。
What lovely weather for ducks. I forgot my umbrella at home.
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