It is going to rain. You should bring a raincoat or an umbrella along with you.

It is going to rain, so you should bring a raincoat or an umbrella along with you.

It is going to rain, because you should bring a raincoat or an umbrella along with you.

It is going to rain, but you should bring a raincoat or an umbrella along with you.

It is going to rain, or you should bring a raincoat or an umbrella along with you.