Júliusban meleg van.

Because Hungarian often adds a case ending directly to the noun instead of using a separate preposition.

Here, -ban means in, so:

• július = July
• júliusban = in July

The capital J appears because this word is at the beginning of the sentence. Normally, month names in Hungarian are written with a lowercase letter: július.

This is because of vowel harmony, a very important feature of Hungarian.

Hungarian suffixes often change their vowel to match the vowels in the word they attach to:

• -ban after back-vowel words
• -ben after front-vowel words

július contains back vowels, so it takes -ban:

• júliusban = in July

For comparison:

• kertben = in the garden

Because Hungarian usually expresses meanings like in, on, at, and many others with suffixes attached to the noun.

So English:

• in July

becomes Hungarian:

• júliusban

This is very normal in Hungarian grammar.

Van is the 3rd person singular form of lenni, meaning to be.

In weather or general-condition expressions, Hungarian commonly uses:

• meleg van = it is warm / it is hot
• hideg van = it is cold
• sötét van = it is dark

So Júliusban meleg van is literally something like In July, warm is in English word order, but naturally it means It is warm in July.

That is a very common question.

In Hungarian, the present-tense form of to be is often omitted in simple sentences with a subject and an adjective or noun:

• A víz hideg. = The water is cold.
• Péter orvos. = Péter is a doctor.

But in expressions about existence, location, weather, or general states, van is usually kept:

• Meleg van. = It is warm.
• Itt van. = He/it is here.
• Sok ember van itt. = There are many people here.

So meleg van is a fixed, natural Hungarian pattern.

Because Hungarian does not need a dummy subject like English it in weather sentences.

English says:

• It is warm.

But that it does not refer to anything specific. Hungarian simply leaves it out:

• Meleg van.

This is completely normal.

Yes, meleg is an adjective, but in Hungarian adjectives can be used directly in predicates.

So meleg van literally uses meleg as the main descriptive word:

• meleg = warm / hot
• meleg van = it is warm / the weather is warm

Hungarian does this very naturally with many adjectives:

• Hideg van. = It is cold.
• Csend van. = It is quiet.
  (Here csend is actually a noun, but the structure is similar in feel.)

Yes, but the meaning or emphasis may shift.

Júliusban meleg van is a very natural neutral sentence, with Júliusban setting the time first: In July, it is warm.

You could also say:

• Meleg van júliusban.

This is also understandable, but it may sound like the speaker is putting a bit more focus on meleg van first, then adding júliusban.

Hungarian word order is flexible, but it is not random. It often shows what is the topic, what is emphasized, and what is new information.

No. Unlike English, Hungarian normally writes month names with a lowercase letter:

• január
• február
• július

In this sentence, Júliusban is capitalized only because it begins the sentence.

If it appeared in the middle, it would usually be:

• Nyáron, különösen júliusban, meleg van.

Approximately:

• Júliusban ≈ YOO-lee-oosh-bon
• meleg ≈ MEH-leg
• van ≈ von / vawn (depending on how you approximate Hungarian a)

A few useful pronunciation notes:

• Hungarian stress is usually on the first syllable: JÚliusban, MEleg, VAN
• j sounds like English y
• s sounds like English sh
• g is always a hard g

So the whole sentence is roughly:

YOO-lee-oosh-bon MEH-leg von

It can cover both, depending on context.

In a sentence like Júliusban meleg van, meleg usually means warm or hot in a general way: the weather is warm/hot in July.

Hungarian meleg is broader than English warm in some contexts. If you want to know the exact temperature feeling, context matters. But for everyday weather talk, meleg van is the normal expression.