Learn Portuguese (Portugal): Aqui em Lisboa faz vento.

In Portuguese, we often use the verb fazer (to make/do) for the weather instead of the verb "to be". So instead of saying "it is windy", you literally say "it makes wind" (faz vento). You will also see this with sunshine (faz sol) and cold (faz frio).

Is vento an adjective or a noun here?

Vento is a noun meaning "wind", which is why it pairs with the verb fazer (to make). If you wanted to use the adjective "windy" (ventoso), you would use the verb estar (to be) to say está ventoso. However, faz vento is much more common in everyday speech.

Could I change the word order to Faz vento aqui em Lisboa?

Yes, absolutely! Portuguese word order is very flexible. Starting with Aqui em Lisboa puts the emphasis on the location, but putting it at the end of the sentence is also completely natural.

Why is it em Lisboa instead of na Lisboa?

Most cities and towns in Portuguese do not take a definite article (the equivalent of "the"). Because of this, the preposition em (in/at) stays exactly as it is and doesn't combine with an "a" to become na. You just say em Lisboa.