every storm runs out of rain

We will make it through this because every storm runs out of rain and after there's always a beautiful rainbow
(a quote from the internet)

Does the phrase in bold mean "every storm has a limited amount of rain"? That is, "run out of" here means "use up"...:-?
Thank you.

I assume so. It's not an idiom. Yes, it means "uses up".

It means that with any storm associated with rain, the rain eventually stops. That is usually because of a change in conditions. I wouldn't use the phrase "use up" to describe that.

I assume it's being used metaphorically here to refer to troubles or difficulties because of the beginning.

Tdol said:

I assume it's being used metaphorically here to refer to troubles or difficulties because of the beginning.

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Sorry, I don't quite understand -- the beginning of what?

The beginning of the sentence: 'We will make it through this.'

Rover_KE said:

The beginning of the sentence: 'We will make it through this.'

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Troubles or difficulties because of "this" (where "this" is some unpleasant situation) -- that's how I understand it, am I wrong?

MikeNewYork said:

I wouldn't use the phrase "use up" to describe that.

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[Not a meteorologist]
No one wants to use that phrase. The OP is merely checking his understanding. A storm running out of rain is a storm using up the rain it has stored in the clouds. If there is a phrase that needs correcting here it's "the storm runs out of rain".