Excuse the mess it made, it usually doesn't rain
In Southern California,

from Frank Ocean – Thinking Bout You Lyrics on Rap Genius

This could be a reference to the Toni! Toné! Tony! song: http://www.youtube.com/watch?v=3yNibj8LW-Q

The Albert Hammond song:
http://www.youtube.com/watch?v=-pyC7WnvLT4

The symbolism:
California is a happy place. A place where it doesn’t “rain”

“Excuse the mess it made” is just talking abut how he’s messed up in the head. Whether from Katrina or some other life experience or relationship.

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