I keep fallin, I keep fallin, I keep fallin, down the rain
Keeps pourin, keeps pourin, I don’t know if I can get up today
Keep fallin, I keep fallin, fallin, down the rain
Keeps pourin, keeps pourin, I don’t know if I can get up today

from Macklemore – Fallin' Lyrics on Rap Genius

Meaning

Rain is depressing, and often will make people want to stay in bed and watch The Notebook all day. Additionally, when it rains, people tend to look out windows and think about things, which is what this song is all about.
Macklemore is from Seattle, where it rains quite frequently. Also, rain here is symbolizing his emotional state of mind.

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