Here's a breakdown:
* Hace: This verb means "it is" or "it makes" and is used to talk about the weather.
* Mal: This means "bad".
* Tiempo: This means "weather".
So, the phrase literally means "it makes bad weather".
Here are some examples of how to use "hace mal tiempo":
* "Hace mal tiempo hoy." (The weather is bad today.)
* "No podemos ir a la playa porque hace mal tiempo." (We can't go to the beach because it's bad weather.)
* "Espero que no haga mal tiempo para el picnic." (I hope the weather isn't bad for the picnic.)