Rainy Weather
noun
You see the kanji for rain being followed by the 天 kanji from 天気 (weather). This word means rainy weather.
This has a formal nuance to it, and is often used for event announcements (whether to postpone it in case of rainy weather, etc).
This is a jukugo word, so you use on'yomi readings. You should be familiar with the on'yomi reading for 天 already, but not for 雨. So here's a mnemonic to help you remember:
The rainy weather won't stop you to go catch some uni (う). You would get wet anyway diving into the ocean to collect uni, the rainy weather doesn't affect you. You can also sell them for ten (てん) bucks a piece! The rainy weather isn't at all a problem for a uni hunting if you're making ten dollars for each, you know?
雨天の場合、花火大会は中止です。
The fireworks will be canceled in case of rainy weather.
マリンスポーツは雨天でもできますか？
Can we still do marine sports under a rainy weather?
雨天の心配は今のところなさそうです。
It seems like there's no concern for the rainy weather for now.