The weather is changeable-how to say it in English?

1. The weather is changeable these days. ：

This time of year is changeable.

2. The changeable weather in April:

The weather in April.

He has a changeable temper this week. Don't make him angry. ：

His temper is changeable this week, so don't provoke him.

Impermanence: constant change

Example:

1. I hope you don't be so fickle and make up your mind!

I wish you wouldn't be so capricious, make up your mind!

That girl's capricious personality makes us angry.

The girl's bohemian character annoyed us.