A vízhőmérséklet jó, hacsak nincs javítás az uszodában.

In Hungarian, the verb to be is usually left out in the present tense, third person when one noun or adjective is linked to another.

So:

• A vízhőmérséklet jó = The water temperature is good

There is no written van here, even though English needs is.

Compare:

• A vízhőmérséklet jó. = The water temperature is good.
• A vízhőmérséklet nem jó. = The water temperature is not good.

But if you need there is / there are, or if the structure is different, then van / nincs can appear, as in the second clause.

Hacsak means unless.

It introduces an exception:

• A vízhőmérséklet jó = The water temperature is good
• hacsak nincs javítás az uszodában = unless there are repairs at the swimming pool

So the whole sentence means that the water temperature is generally good, except in the case that repairs are going on.

A useful way to think of hacsak is:

• hacsak + not / negative idea = unless

That is why it is followed here by nincs.

Hungarian does not normally say nem van for there is not / there are not.

Instead, it uses the special negative form:

• van = there is / there are
• nincs = there is not / there are not

So:

• Van javítás az uszodában. = There are repairs at the swimming pool.
• Nincs javítás az uszodában. = There are no repairs at the swimming pool.

This is one of the most important beginner patterns in Hungarian.

Javítás literally means repair or repair work.

In this sentence, it is best understood as:

• repair work
• maintenance
• repairs

Even though it is singular in form, Hungarian often uses a singular noun where English might prefer a plural or an uncountable expression.

So nincs javítás is very natural Hungarian for something like:

• there are no repairs going on
• no repair work is being done

Hungarian and English do not always use singular and plural in the same way.

Hungarian often uses a singular noun to express an activity or general situation:

• javítás = repair work / repairing
• felújítás = renovation work

So nincs javítás az uszodában does not necessarily mean only one repair. It can mean that no repair work is happening.

This is very common in Hungarian, especially when the noun refers to a process or ongoing activity.

This form has two parts:

• az uszoda = the swimming pool / swimming baths
• -ban / -ben = in

So:

• uszodában = in the swimming pool / at the swimming pool
• az uszodában = in the swimming pool / at the swimming pool

The ending is -ban here because of vowel harmony.

Also, the article is az, not a, because the next word begins with a vowel:

• a vízhőmérséklet
• az uszoda
• az uszodában

-ban / -ben is the inessive case, which usually means in or inside.

Examples:

• a házban = in the house
• az iskolában = in the school
• az uszodában = in the swimming pool / at the swimming pool

In this sentence, az uszodában refers to the place where the repair work is happening.

Depending on context, English may translate it as either:

• in the swimming pool
• at the swimming pool

Yes. Hungarian very often forms compounds as a single word.

Here:

• víz = water
• hőmérséklet = temperature

Together:

• vízhőmérséklet = water temperature

This is completely normal in Hungarian. English often writes such combinations as two words, while Hungarian commonly joins them into one.

Because hacsak introduces a subordinate clause, similar to unless in English.

So the sentence is divided into:

• main clause: A vízhőmérséklet jó
• subordinate clause: hacsak nincs javítás az uszodában

Hungarian punctuation often follows a similar logic to English in this kind of sentence, so the comma is expected here.

Yes, Hungarian word order is flexible, although different orders can sound more or less natural depending on emphasis.

For example, you could also say:

• Hacsak nincs javítás az uszodában, a vízhőmérséklet jó.

That means essentially the same thing: Unless there are repairs at the swimming pool, the water temperature is good.

The original version sounds like:

• first stating the normal situation
• then adding the exception

So it feels very natural in everyday speech.

Hungarian often uses the definite article where English also would:

• A vízhőmérséklet jó. = The water temperature is good.

Without the article, Vízhőmérséklet jó would sound incomplete or unnatural in normal standard Hungarian.

The article a / az is very common with specific nouns, and here the speaker means a particular water temperature in a known context, not the concept of water temperature in general.

It can mean more than just good in the narrow sense.

In this sentence, jó could suggest:

• good
• fine
• okay
• suitable
• pleasant

So A vízhőmérséklet jó might mean that the temperature is acceptable or pleasant for swimming, not necessarily excellent in some absolute sense.

Hungarian jó is a very common and flexible adjective, much like English good.

Yes, depending on the situation.

Some possible alternatives are:

• felújítás = renovation
• karbantartás = maintenance
• javítások = repairs

But javítás is natural if the speaker simply means that some repair work may be going on.

The exact choice depends on nuance:

• javítás = repair work
• felújítás = bigger renovation or refurbishment
• karbantartás = routine maintenance

So the original sentence is grammatically fine and natural, but other nouns could be used if the meaning changes slightly.