(as) right as rain

:  righteous, upright

:  being in accordance with what is just, good, or proper

:  conforming to facts or truth :  correct

:  qualities (such as adherence to duty or obedience to lawful authority) that together constitute the ideal of moral propriety or merit moral approval

:  something to which one has a just claim: such as

:  the power or privilege to which one is justly entitled

:  according to right

:  in the exact location, position, or moment :  precisely

:  in a suitable, proper, or desired manner

:  to do justice to :  redress the injuries of

:  justify, vindicate

:  avenge

:  water falling in drops condensed from vapor in the atmosphere

:  the descent of this water

:  water that has fallen as rain :  rainwater

:  to send down rain

:  to fall as water in drops from the clouds

:  to fall like rain