La temperatura varía.

In Spanish, the definite article is often used more than in English. La temperatura is the normal way to say the temperature.

In a sentence like this, Spanish usually prefers the article:

• La temperatura varía.

Saying just Temperatura varía would sound incomplete or unnatural in standard Spanish.

Because temperatura is a feminine noun in Spanish. Most nouns ending in -a are feminine, and temperatura is one of them.

So it goes with:

• la temperatura
• not el temperatura

This also affects any adjectives that agree with it:

• la temperatura alta
• la temperatura media

Varía is the third-person singular present tense of the verb variar.

So:

• yo varío = I vary
• tú varías = you vary
• él / ella / usted varía = he / she / you vary

Here, the subject is la temperatura, which is singular, so the verb must also be singular:

• La temperatura varía.

Spanish often leaves out subject pronouns because the verb ending already shows the person and number.

So instead of saying:

• Ella varía

Spanish normally says:

• Varía

And in your sentence, the subject is already stated:

• La temperatura varía.

Adding ella would usually be unnecessary unless you wanted emphasis or contrast.

The accent mark shows that the i is stressed and pronounced as a separate syllable from the a.

So varía is pronounced roughly as:

• va-RÍ-a

Without the accent, Spanish spelling rules would suggest a different pronunciation pattern. The written accent helps show the correct stress and syllable division.

In Spain Spanish, it is pronounced approximately:

• ba-RI-a

A few useful details:

• v in Spanish sounds very similar to b
• the stress is on rí
• ía is pronounced in two syllables: í-a

So it is va-rí-a, three syllables.

Most naturally, it means The temperature varies.

The Spanish present tense can sometimes also refer to something happening now, depending on context, but in a sentence like this it usually expresses a general fact or repeated action.

If you specifically wanted is varying/changing right now, Spanish might more explicitly say:

• La temperatura está variando.

But La temperatura varía is the normal simple statement.

Yes. La temperatura cambia is also correct, but it is slightly different in nuance.

• variar = to vary, to fluctuate, to differ
• cambiar = to change

So:

• La temperatura varía suggests fluctuation or variation
• La temperatura cambia suggests change more generally

In many contexts they can be similar, but varía often sounds a bit more precise if you mean that the temperature goes up and down or differs depending on conditions.

Yes, but La temperatura varía is the most neutral and natural order.

You could also say:

• Varía la temperatura

But that usually sounds more marked, literary, or context-dependent. Spanish allows more flexibility in word order than English, but the standard pattern here is:

• subject + verb
• La temperatura varía.

It can do both, depending on context.

Spanish often uses the definite article for general ideas:

• La temperatura varía. = temperature varies / the temperature varies

So even though English might sometimes prefer no article in a general statement, Spanish commonly uses la.

Context tells you whether it means:

• temperature in general
• the temperature in a particular place or situation

It is mostly regular, but the written accent in some forms is important.

Present tense:

• yo varío
• tú varías
• él/ella/usted varía
• nosotros variamos
• vosotros variáis
• ellos/ellas/ustedes varían

The endings are regular for an -ar verb, but forms like varío, varías, varía need written accents to show the correct pronunciation.

Yes, it sounds completely natural. It is a normal, clear way to express that temperature changes or fluctuates.

For example:

• La temperatura varía según la hora del día.
• En esta zona, la temperatura varía mucho.

So as a standalone sentence, La temperatura varía is perfectly good Spanish.