Boy, that's a loaded question!
In theory, it might be possible. If you can safely get the step you wanted painted dry, you can paint it. But that's a big "IF". Many liner pools can't be drained that far. Ditto, for fiberglass. Given that you're in California, odds are you've got a concrete pool . . . and again, since you're in California, odds are the ground is dry enough so that draining doesn't risk floating the pool.
But, when you paint, surface prep is *critical*, and doing the surface prep without messing up the pool water could be tricky.
Good luck!
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