Májusban meleg van.

-ban means in.

So:

• május = May
• májusban = in May

This is a case ending, not a separate word. Hungarian often adds meanings like in, on, from, to directly to the end of a noun.

Here, -ban is the inessive ending, which is commonly used for in.

Because of vowel harmony, some words take -ban, while others take -ben.

Because it is the first word of the sentence.

In Hungarian, the names of months are normally not capitalized in the middle of a sentence. So you would usually write:

• májusban

But at the beginning of a sentence, it becomes:

• Májusban

This is different from English, where May is always capitalized.

Because Hungarian is an agglutinative language. That means it often expresses grammar by adding endings to words.

So instead of:

• in
  • May

Hungarian uses:

• május
  • -ban

This is very common in Hungarian. English often uses separate little words; Hungarian often uses suffixes.

Hungarian does not use a dummy subject like English it in weather or general-condition sentences.

English says:

• It is warm.

But Hungarian simply says:

• Meleg van.

There is no actual word for it here. The idea is understood from the context.

This is normal in Hungarian.

That is a very good question, because both patterns exist in Hungarian.

Hungarian often leaves out van in the present tense, third person, when you have a normal subject + adjective or noun:

• A szoba meleg. = The room is warm.
• Péter tanár. = Péter is a teacher.

But in expressions describing a general condition or environment, Hungarian usually keeps van:

• Meleg van. = It is warm.
• Hideg van. = It is cold.
• Sötét van. = It is dark.
• Csend van. = It is quiet.

So meleg van is a fixed, natural way to say that the weather or surrounding temperature is warm.

Literally, yes, it looks like warm is, but that is not how you should think of it in real use.

As a natural expression, meleg van means:

• it is warm
• the weather is warm
• it’s warm out

It refers to the general temperature or atmosphere around you.

So it is best learned as a whole expression.

Yes, you can, but the emphasis changes.

• Májusban meleg van. puts the focus on in May.
• Meleg van májusban. puts the focus more on it is warm.

Hungarian word order is flexible, and it often reflects emphasis or what is already known in the conversation.

If you are simply making a neutral statement like In May it is warm, the original sentence is very natural.

Yes. That would also be correct.

• Májusban meleg van.
• Májusban meleg az idő.

Both can mean It is warm in May.

The difference is small:

• meleg van sounds more like a general condition or temperature around you
• meleg az idő explicitly mentions the weather

In everyday speech, meleg van is very common and natural.

Not by itself.

Májusban meleg van. is a general statement, like saying In May, it is warm.

The place is not stated, so it depends on context. It might mean:

• in this country
• in this city
• here in general

If you want to add a place, you can:

• Májusban Budapesten meleg van. = In May, it is warm in Budapest.

A simple English-style approximation is:

• MAA-yoosh-bahn MEH-leg vawn

A few useful pronunciation points:

• á is a long vowel
• j sounds like English y
• s sounds like English sh
• stress is usually on the first syllable of each word

So roughly:

• MÁ-jus-ban
• ME-leg
• van

A natural negative version is:

• Májusban nincs meleg. = It is not warm in May.

You may also hear:

• Májusban nem meleg az idő. = The weather is not warm in May.

Both are correct, but they are built differently:

• van becomes nincs in the general-condition pattern
• with az idő, you can use nem meleg

So the original pattern:

• Meleg van. → Nincs meleg.

is worth remembering as a useful pair.