Es mejor que no salgas sin paraguas cuando llueve.

Because es mejor que usually triggers the subjunctive in Spanish.

• sales = present indicative
• salgas = present subjunctive

Spanish uses the subjunctive after expressions of advice, recommendation, judgment, or necessity, and es mejor que... fits that pattern.

So:

• Es mejor que no sales... ❌
• Es mejor que no salgas... ✅

In English, we do not usually notice this kind of mood change, so it can feel strange at first.

It literally means It is better that...

It is an impersonal expression:

• es = it is
• mejor = better
• que = that

Then Spanish adds a clause with the subjunctive:

• Es mejor que no salgas...
• It’s better that you not go out...

In natural English, we might say:

• You’d better not go out...
• It’s better not to go out...

But in Spanish, es mejor que + subjunctive is a very common structure.

Salgas comes from the verb salir = to go out / to leave.

This is the tú form of the present subjunctive.

A quick pattern:

• yo salgo
• present subjunctive stem: salg-
• que tú salgas

Other present subjunctive forms of salir are:

• yo salga
• tú salgas
• él/ella/usted salga
• nosotros/nosotras salgamos
• vosotros/vosotras salgáis
• ellos/ellas/ustedes salgan

In Spanish, no goes directly before the conjugated verb.

So:

• no salgas = don’t go out / that you not go out

That is the normal position for negation in Spanish.

Compare:

• Sales = You go out
• No sales = You do not go out
• Salgas = you go out (subjunctive context)
• No salgas = that you not go out / don’t go out

Sin paraguas is the most natural way to say without an umbrella in a general sense.

Spanish often omits the indefinite article after sin when talking about something in a general, non-specific way.

So:

• sin paraguas = without an umbrella
• sin un paraguas can be understood, but it sounds more marked or specific

In this sentence, the idea is general:

• Don’t go out without an umbrella when it rains.

So sin paraguas is exactly what you would expect.

Because here cuando refers to something habitual or generally true, not to a specific future event.

• cuando llueve = when it rains / whenever it rains

The indicative is used because the speaker is talking about a real, repeated situation.

If you were talking about a future event that has not happened yet, Spanish often uses the subjunctive:

• Cuando llueva, no salgas sin paraguas.
• When it rains / when it does rain, don’t go out without an umbrella.

So:

• cuando llueve = general habit or repeated fact
• cuando llueva = future or uncertain event

Yes, absolutely.

Both are correct, but they are structured differently:

• Es mejor que no salgas sin paraguas cuando llueve.

  • more directly aimed at you
  • It’s better that you not go out...

• Es mejor no salir sin paraguas cuando llueve.

  • more general, more like It’s better not to go out...

So the original sentence is more personal because it addresses the listener through salgas.

Because paraguas is one of those Spanish nouns whose form often stays the same in singular and plural.

So:

• un paraguas = an umbrella
• dos paraguas = two umbrellas

The article or context tells you whether it is singular or plural.

Also, paraguas is masculine:

• el paraguas
• un paraguas

Even though it ends in -as, it is masculine.

In this sentence, to go out is usually the best translation.

• salir can mean to leave, to go out, or to come out, depending on context.
• With weather and sin paraguas, the idea is clearly going outside.

So:

• Es mejor que no salgas sin paraguas cuando llueve.
• It’s better not to go out without an umbrella when it rains.

Here que means that and introduces the second clause.

Structure:

• Es mejor = It is better
• que no salgas... = that you not go out...

In English, we often omit that, but in Spanish it is required in this kind of structure.

So Spanish says:

• Es mejor que...

not:

• Es mejor no salgas... ❌

Yes. Salgas is the tú form, so it is talking to you singular in an informal way.

If you wanted other versions:

• Es mejor que no salga... = formal singular (usted) / he / she
• Es mejor que no salgáis... = informal plural in Spain (vosotros)
• Es mejor que no salgan... = ustedes / they

Since the sentence is for Spain, learners should especially notice:

• tú → salgas
• vosotros → salgáis

You could, but it would change the nuance.

• cuando llueve = when it rains / whenever it rains
  • general, habitual
• cuando está lloviendo = when it is raining
  • focuses more on the action in progress at that moment

In your sentence, cuando llueve is more natural because it gives general advice.

So:

• Es mejor que no salgas sin paraguas cuando llueve. ✅ very natural
• Es mejor que no salgas sin paraguas cuando está lloviendo. possible, but less natural for a general statement

Yes. It sounds like advice or a recommendation, not like a direct order.

That is one reason es mejor que... is useful:

• it softens the message
• it sounds less direct than an imperative

Compare:

• No salgas sin paraguas.

  • direct command: Don’t go out without an umbrella.

• Es mejor que no salgas sin paraguas cuando llueve.

  • softer advice: It’s better not to go out without an umbrella when it rains.

So the original sentence feels more polite and less forceful.