Komu ćemo javiti kamo idemo ako se ne razvedri do večeri?

Komu is the dative singular form of tko (who).

Here it means to whom or who ... to:

• Komu ćemo javiti ... ? = Who will we inform / tell ... ?

The verb javiti often takes:

• a dative person: komu = to whom
• plus the information being communicated: kamo idemo = where we’re going

A very common alternative is kome. Both are correct, but kome is more common in everyday speech, while komu can sound a bit more formal or literary.

Javiti usually means to let someone know, to inform, to tell, or to report.

In this sentence, it means something like:

• Who will we let know where we’re going...?

A useful pattern is:

• javiti komu nešto
• javiti komu da...
• javiti komu kamo...

Examples:

• Javit ću mami. = I’ll let Mom know.
• Javit ću joj da kasnim. = I’ll let her know that I’m late.
• Javit ćemo komu idemo. = We’ll tell someone who we’re going to see.

So here komu is the person receiving the information.

Croatian forms the future tense like this:

• htjeti in its short clitic form + infinitive

So:

• ćemo javiti = we will inform
• literally: will-we inform

The forms are:

• ću
• ćeš
• će
• ćemo
• ćete
• će

Examples:

• doći ćemo = we will come
• reći ću = I will say
• vidjet će = he/she will see

In your sentence:

• ćemo javiti = we will let know / will inform

Because ćemo is a clitic, and Croatian clitics normally go in the second position of the clause.

So in:

• Komu ćemo javiti ... ?

the first element is Komu, and the clitic ćemo comes right after it.

This second-position rule is very common in Croatian with:

• short forms of biti
• short forms of htjeti
• short object pronouns
• se

Compare:

• Sutra ćemo doći. = Tomorrow we’ll come.
• Ivanu ću reći. = I’ll tell Ivan.
• To mi je rekao. = He told me that.

So ćemo is where you would expect it to be.

Because kamo is used for destination—where to.

• kamo = where to, to where
• gdje = where, location
• odakle = from where

Since ići means to go, it often involves movement toward a destination, so kamo is very natural:

• Kamo idemo? = Where are we going?

Compare:

• Gdje smo? = Where are we?
• Kamo idemo? = Where are we going?
• Odakle dolazite? = Where are you coming from?

In casual speech, people do sometimes say Gdje idemo?, but kamo is more precise here.

Croatian often uses the present tense in subordinate clauses to talk about something future, especially when the future meaning is already clear from context.

So:

• kamo idemo literally looks like where we are going
• but in context it means where we’re going / where we’ll be going

This is very natural in Croatian.

English also does something similar sometimes:

• Tell me where you’re going tomorrow.

You do not have to force a separate future form in Croatian here.

Ako means if.

It introduces the condition:

• ako se ne razvedri do večeri = if it doesn’t clear up by evening

So the sentence structure is:

• main question: Komu ćemo javiti kamo idemo
• condition: ako se ne razvedri do večeri

In other words:

• Who will we tell where we’re going, if it doesn’t clear up by evening?

The verb here is razvedriti se, which means to clear up when talking about weather.

So:

• razvedriti se = to become clear, to clear up
• ne razvedri se / se ne razvedri = it does not clear up

The se is part of the verb. It is not a separate word with a direct English equivalent here; it belongs to the reflexive/intransitive form.

Common weather example:

• Razvedrilo se. = It cleared up.

In your sentence:

• ako se ne razvedri do večeri = if it doesn’t clear up by evening

After ako (if), Croatian commonly uses the present tense to refer to a future condition.

So:

• ako se ne razvedri do večeri = literally if it does not clear up by evening
• natural English: if it doesn’t clear up by evening

Also, razvedriti se is a perfective verb. Perfective present forms often refer to a future completed event, especially in clauses like this.

This is very normal Croatian grammar:

• Ako dođe, reci mi. = If he comes, tell me.
• Ako ne stigne na vrijeme, počet ćemo bez njega. = If he doesn’t arrive on time, we’ll start without him.

So the present form after ako is exactly what you expect.

Do večeri means by evening or until evening.

The preposition do requires the genitive case, so:

• večer = evening
• do večeri = by/until evening

Other examples:

• do jutra = by morning / until morning
• do kraja = until the end
• do kuće = up to the house / as far as the house

So večeri is genitive singular after do.

Yes, usually.

Both are standard, but:

• kome is more common in everyday conversation
• komu can sound a bit more formal, literary, or stylistically elevated

So a learner is more likely to hear:

• Kome ćemo javiti...?

But Komu ćemo javiti...? is still correct Croatian.

Yes, Croatian word order is flexible, though not completely free.

Possible variants include:

• Komu ćemo javiti kamo idemo ako se ne razvedri do večeri?
• Ako se ne razvedri do večeri, komu ćemo javiti kamo idemo?

Both are natural. The first version puts the main question first. The second emphasizes the condition first.

What usually stays important:

• the clitic ćemo still tends to be in second position in its clause
• kamo idemo stays together as a unit meaning where we’re going

So you can move chunks around for emphasis, but not randomly.

Because Croatian usually doesn’t need subject pronouns when the verb form already shows the person.

• ćemo already tells you it is we
• idemo also shows we

So mi would usually be unnecessary unless you want emphasis or contrast.

Compare:

• Ćemo javiti. / Javit ćemo. = We will inform.
• Mi ćemo javiti, ne oni. = We will inform, not they.

In your sentence, leaving out mi is completely normal.

The main question is about the person:

• Komu ćemo javiti ... ? = Whom / to whom will we tell ... ?

The destination is inside the subordinate clause:

• kamo idemo = where we’re going

So the sentence does not ask:

• Where are we going?

It asks:

• Who will we tell where we’re going?

That distinction is important because Croatian marks it clearly with:

• komu = the person receiving the information
• kamo = the destination being talked about