Червень сонячний.

In Ukrainian, the verb to be is usually left out in the present tense.

So:

• Червень сонячний = June is sunny

This is completely normal Ukrainian.
If you said it word-for-word with a present-tense is, it would sound unnatural.

You may still see forms of бути (to be) in the past or future:

• Червень був сонячний = June was sunny
• Червень буде сонячний = June will be sunny

Because сонячний is an adjective, and it has to agree with the noun червень.

Червень is:

• masculine
• singular
• nominative

So the adjective also appears in the masculine singular nominative form:

• сонячний

If the noun changed, the adjective would change too. For example:

• ніч сонячна = the night is sunny
• літо сонячне = the summer is sunny

Both are in the nominative case.

That is because:

• Червень is the subject
• сонячний is a predicate adjective describing the subject

This is similar to English June is sunny, where sunny describes June.

A rough pronunciation guide is:

• Червень ≈ CHEHR-venʹ
• сонячний ≈ SO-nyach-nyy

A few helpful points:

• ч sounds like ch in church
• я after a consonant often gives a ya sound and can soften the previous consonant
• ь (the soft sign) has no sound of its own; it softens the consonant before it
• the -ий ending is usually pronounced something like -yy

A natural full pronunciation is roughly:

CHEHR-venʹ SO-nyach-nyy

The soft sign ь does not have its own sound. Its job is to soften the consonant before it.

So in червень, the final н is pronounced softly.

This is an important feature of Ukrainian pronunciation.
For English speakers, it may feel a bit like adding a slight y quality to the consonant, though not as a full extra sound.

Yes — in Ukrainian, the names of months are normally written with a lowercase letter:

• червень
• липень
• серпень

In your sentence, Червень is capitalized only because it is the first word of the sentence.

So inside a sentence, you would usually write:

• У червні сонячно.

Yes, but it does not mean exactly the same thing stylistically.

• Червень сонячний is a full sentence: June is sunny
• Сонячний червень is more like a noun phrase: a sunny June

So the version with the adjective first sounds more like:

• a description
• a phrase
• sometimes a poetic or literary expression

If you want a simple neutral sentence, Червень сонячний works better.

Yes, it is natural and grammatical, especially as a short descriptive statement.

However, Ukrainian often uses another very common pattern for weather and conditions:

• У червні сонячно = It is sunny in June / June is sunny

The difference is roughly this:

• Червень сонячний describes June as a thing or period
• У червні сонячно describes the weather during June

Both are good, but the second one is especially common when talking about weather.

Ukrainian has no articles.

So Ukrainian does not have separate words corresponding to English a, an, or the.

That means:

• червень can mean June
• context tells you whether it is general, specific, or part of a broader statement

English needs articles in many places, but Ukrainian usually does not.

Yes, червень is the Ukrainian word for June.

Like several Ukrainian month names, it comes from an older Slavic naming tradition connected with the natural world rather than from Latin-based names like English June.

For a learner, the main thing to remember is simply:

• червень = June

It is a regular masculine noun in Ukrainian.

It can mean either, depending on context.

Without extra context, it is often understood as a general statement:

• June is sunny

But in the right situation, it could also refer to a particular June:

• This June is sunny

Ukrainian often relies on context rather than articles or extra markers to make that distinction clear.