Cuando llega el verano, me gusta beber gazpacho al mediodía.

Because Spanish often uses the present tense for things that happen regularly or are generally true. Here, Cuando llega el verano means when summer comes / when summer arrives, in the sense of every time summer comes around.

It is not talking about one single future event only; it is describing a habitual situation.

Llegar means to arrive / to come, so llega el verano is a very natural Spanish way to say summer arrives / summer comes.

If you said cuando es verano, that would sound less natural here. Spanish often uses seasons as things that arrive:

• llega el verano
• llega el invierno

It gives the idea of the season beginning.

In Spanish, gustar works differently from English to like. Literally, me gusta beber gazpacho is closer to:

• drinking gazpacho is pleasing to me

So:

• me = to me
• gusta = is pleasing

That is why Spanish uses an indirect object pronoun here:

• me gusta = I like
• te gusta = you like
• le gusta = he/she likes

Because the thing being liked is beber gazpacho, and an infinitive verb phrase counts as singular in Spanish.

So:

• Me gusta beber gazpacho = I like drinking gazpacho

Compare:

• Me gusta el gazpacho = I like gazpacho
• Me gustan las sopas frías = I like cold soups

In your sentence, the subject of gusta is the whole action beber gazpacho, so gusta is correct.

In Spain, gazpacho is a cold soup, but it is often treated as something you can drink, especially if it is served in a glass or has a smooth texture.

So beber gazpacho is perfectly natural.

You may also hear:

• tomar gazpacho = to have gazpacho
• sometimes even comer gazpacho, depending on how it is served

But beber gazpacho sounds very normal in Spain.

Al mediodía means at midday / around noon. In Spain, it can also suggest the lunchtime part of the day, not just the exact clock time of 12:00.

It is made from:

• a + el = al
• mediodía = midday / noon

So al mediodía literally means at the midday.

Yes, both a mediodía and al mediodía are used, and both can mean at noon / around midday.

In many contexts, they are very close in meaning. In your sentence, al mediodía sounds completely natural. A learner should mainly recognize that both forms exist and are common.

Because Cuando llega el verano is an introductory time clause. In Spanish, as in English, it is normal to separate that opening clause with a comma:

• Cuando llega el verano, me gusta beber gazpacho al mediodía.

If the time clause comes after the main clause, the comma is often omitted:

• Me gusta beber gazpacho al mediodía cuando llega el verano.

Spanish often uses the definite article with seasons, especially when they are the subject of the sentence:

• llega el verano
• empieza el otoño

So el verano here is completely normal. Spanish uses articles more often than English in these kinds of expressions.

Yes. That is also correct, but the nuance is slightly different.

• Cuando llega el verano = when summer comes / when summer arrives
• En verano = in summer / during the summer

The first emphasizes the arrival or beginning of the season a little more. The second is a more general time expression.

Yes, very naturally.

• Me gusta beber gazpacho al mediodía = I like drinking gazpacho at midday
• Me gusta tomar gazpacho al mediodía = I like having gazpacho at midday

In everyday Spanish, tomar is often very common for food and drink, and many speakers might choose it here.

It breaks down like this:

• Cuando llega el verano = time clause
• me gusta = I like
• beber gazpacho = to drink gazpacho
• al mediodía = at midday

So the overall pattern is:

When summer comes, I like to drink gazpacho at midday.

This is a very useful Spanish structure:

• Cuando + present tense, ...
• me gusta + infinitive

It sounds like a habit or a repeated preference. The present tense and the structure of the sentence suggest:

• whenever summer comes around, this is something I enjoy doing

If you wanted to talk about one specific day or event, Spanish would normally use a different context or different tenses.