Sulla terrazza il vento è freddo, quindi metto la felpa.

Sulla is the combination of su + la.

• su = on
• la = the

So:

• su la terrazza → sulla terrazza

This is very common in Italian. Prepositions often combine with definite articles:

• su + il = sul
• su + la = sulla
• in + il = nel
• a + il = al

So sulla terrazza means on the terrace.

In Italian, you normally need the article when talking about a specific place: la terrazza.

Because the article is there, the preposition combines with it:

• la terrazza = the terrace
• su la terrazza = on the terrace
• sulla terrazza = on the terrace

English often leaves articles out in places where Italian does not.

Italian uses definite articles much more often than English.

So where English might say wind in a general or situational way, Italian often says il vento.

Other common examples:

• il sole = the sun
• la pioggia = the rain
• il freddo = the cold

So il vento è freddo is completely normal Italian.

Because freddo has to agree with vento.

• vento is masculine singular
• so the adjective must also be masculine singular: freddo

Compare:

• il vento è freddo
• la brezza è fredda

This kind of adjective agreement is very important in Italian.

The accent distinguishes the verb è from e.

• è = is
• e = and

So in this sentence, è freddo means is cold.

The accent is required in standard writing.

Italian often leaves out subject pronouns because the verb ending already shows who the subject is.

• metto = I put on / I put
• metti = you put
• mette = he/she puts

So metto la felpa already clearly means I put on the sweatshirt / hoodie.

You can add io if you want emphasis or contrast:

• Io metto la felpa, tu no. = I’m putting on the sweatshirt, you aren’t.

Yes. In everyday Italian, mettere can be used for clothing to mean put on.

So metto la felpa naturally means I put on the sweatshirt/hoodie.

You may also hear:

• mi metto la felpa
• indosso la felpa

These are all possible, but they are slightly different in feel:

• metto la felpa = I put on the sweatshirt
• mi metto la felpa = I put the sweatshirt on myself / I’m putting on the sweatshirt
• indosso la felpa = I wear / I put on the sweatshirt, a bit more formal or explicit

In normal conversation, metto la felpa is very natural.

Felpa usually means a sweatshirt. In many contexts, it can also refer to a hoodie, especially in casual speech.

If you want to be very specific:

• felpa = sweatshirt
• felpa con cappuccio = hoodie

So the exact English word depends a little on context.

Quindi means so, therefore, or thus.

It connects the first idea to the result:

• The wind is cold, so I put on the sweatshirt.

It is a very common connector in Italian.

Other examples:

• Sono stanco, quindi vado a letto. = I’m tired, so I’m going to bed.
• Piove, quindi resto a casa. = It’s raining, so I’m staying home.

Italian uses the present tense for both a current situation and an immediate reaction.

So:

• il vento è freddo = the wind is cold
• metto la felpa = I put on / am putting on the sweatshirt

In English, you might sometimes prefer I’m putting on my hoodie, but Italian often just uses the simple present in this kind of situation.

Starting with Sulla terrazza sets the scene first: On the terrace...

That is very natural in Italian. It tells you where the situation is happening before giving the main information.

A more neutral order like this is also possible:

• Il vento è freddo sulla terrazza, quindi metto la felpa.

Both are correct. Beginning with Sulla terrazza simply gives a stronger sense of place.

Yes, in many situations in terrazza is also natural.

Very roughly:

• sulla terrazza = on the terrace
• in terrazza = in/on the terrace area, out on the terrace

In real everyday Italian, both can be used depending on the speaker and context. Here, sulla terrazza is perfectly correct and idiomatic.