Learn Portuguese (Portugal): No verão faz calor.

In Portuguese, seasons usually take the definite article (the). So instead of saying 'in summer', you say 'in the summer'. No is the mandatory combination of em (in) and o (the).

Why use faz (makes/does) instead of a verb like é or está for 'is'?

To describe general weather conditions, Portuguese commonly uses the verb fazer (to do/make). Instead of saying 'it is hot', you literally say 'it makes heat' (faz calor). You will also use this rule for cold weather: faz frio.

Is calor an adjective meaning 'hot'?

Calor is actually a noun meaning 'heat'. Because the sentence uses the verb fazer (to make), it needs a noun to complete the phrase: 'makes heat'. If you wanted to describe a hot object, like coffee or a plate, you would use the adjective quente instead.

Why isn't the season verão capitalized?

In Portuguese, the seasons of the year, days of the week, and months are written in lowercase unless they appear at the very beginning of a sentence.