List of rain idioms and phrases:

1. Right as rain

2. Come rain or shine

3. It’s raining cats and dogs

4. Rain check

5. For a rainy day

6. Rainmaker

7. Rain on somebody's parade

8. It never rains but it pours

8 Rain Idioms & Phrases

Rain Idioms

1. Right as rain

to feel healthy or well again

Examples:

She was very ill, but she is right as rain now.

After a few days of rest, he will be right as rain again.

2. Come rain or shine

whatever happens

Examples:

I’ll always be there for you, come rain or shine.

He runs ten kilometers every morning, come rain or shine.

3. It’s raining cats and dogs

used for saying that it is raining very heavily 

Examples:

I can't go now because it's raining cats and dogs.

She was going to go shopping, but it suddenly started raining cats and dogs, so she stayed home.

Keep reading:  Eye Idioms

4. Take a rain check

used for saying that you are not going to accept an offer instantly, but you may accept it later

Examples:

He says he would like to take a rain check on it and do it in March.

I was planning to ask you in for a whiskey, but if you want to take a rain check, that's fine.

5. For a rainy day

for a time in the future when something will be needed

Examples:

I'll put the rest in the bank for a rainy day.

She had saved some money for a rainy day.

6. Rainmaker

a person who makes a business grow and become successful

Examples:

She is a senior partner and top rainmaker at a famous Brooklyn law firm.

Their rival firm had a handful of rainmakers able to woo elite clients from Asia and Europe.

7. Rain on someone's parade

to do something that spoils someone's plans

Examples:

I don't mean to rain on your parade, but I have some bad news.

I'm sorry to rain on your parade but you're not allowed to have alcohol on the premises.

8. It never rains but it pours

used to say that when something bad happens other bad things usually happen at the same time

Examples:

The team not only lost the game but four of its best players were injured. It never rains but it pours.

My car broke down so I took my husband's car to work and ended up with a flat tire. It never rains but it pours.