“rain” in Japanese is 雨, read ame, ama, u (あめ, あま, う). It is a Grade 1 Kyōiku kanji, taught in year 1 of Japanese elementary school, and appears in words such as 大雨 (heavy rain).
What does 雨 mean?
今日は雨がふる。
Same sound, different character — the classic trap. Compare them side by side: