Save, keep, etc. something for a rainy day

Pro Tip 1/3

Understand it comes from a time when bad weather could interrupt income, hence saving for difficult times.

Farmers would often save grain for a rainy day, as they couldn't work in their fields during storms.

Pro Tip 2/3

The phrase is not about actual weather, but about being prepared for any challenging situation.

Even though it's sunny, he still likes to save for a rainy day.

Pro Tip 3/3

Most often used for saving money, but can also apply to other items or situations of eventual need.

I'm keeping these candles for a rainy day in case the power goes out.