昨天下小雨。

There was a light rain yesterday.

Source: Tatoeba

Sentence Composition

1 昨天 zuótiān yesterday
2 下 xià
  1. down
  2. downwards
  3. below
  4. lower
  5. later
  6. next (week etc)
  7. second (of two parts)
  8. to decline
  9. to go down
  10. to arrive at (a decision, conclusion etc)
  11. measure word to show the frequency of an action
3 小雨 xiǎoyǔ
  1. light rain
  2. drizzle