(come) rain or shine
whatever happens or whatever the weather is like

[TahlilGaran] Dictionary of Contemporary English ▲

rain or shine
(come) rain or shine
1.
whatever the weather is.
He runs every morning, rain or shine.

2.
if you say you will do something come rain or shine, you mean you will do it whatever happens.
Come rain or shine, I'll be there, I promise.

[TahlilGaran] English Idioms Dictionary ▲

rain or shine
no matter whether it rains or the sun shines
We plan to go to the beach tomorrow rain or shine.

[TahlilGaran] English Idioms Dictionary ▲

rain or shine
adv. phr.
1. If the weather is stormy or if it is fair.
The parade will start promptly, rain or shine.
2. No matter; if your luck is good or bad.
Sam knows he can depend on his family, rain or shine.

[TahlilGaran] English Idioms Dictionary ▲