Gestern fiel ein leichter Regen.

English Translation

There was a light rain yesterday.

why wouldn’t this be in the accusative? or is fallen here used like sein?

“ein leichter Regen” is in nominative because it is the subject of the sentence.
It’s just that the sentence order is reversed, and the subject is at the end to emphasize “gestern”.

If you put it in normal SVO order it becomes:
Ein leichter Regen fiel gestern.

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thank you. Looking at the sentence again it seems obvious now. D’oh!