Μόλις βουτήξω, βγαίνω αμέσως από το νερό, γιατί δεν μου αρέσει να μένω πολύ ώρα βρεγμένος.

Here μόλις means as soon as.

So:

• Μόλις βουτήξω = As soon as I dive
• It can also mean just in other contexts, for example Μόλις έφτασα = I just arrived

In this sentence, though, it clearly has the as soon as / whenever immediately after meaning.

Βουτήξω is the aorist subjunctive form of βουτάω / βουτώ.

After μόλις meaning as soon as, Greek commonly uses the subjunctive. That is why you see:

• μόλις βουτήξω = as soon as I dive

and not:

• μόλις βούτηξα = that would mean something like as soon as I dived / after I dived in a past context
• μόλις βουτάω = not the normal structure here

The aorist subjunctive is used because the action is viewed as a single complete event: the moment of diving in.

Because the sentence describes a habitual action or a general pattern:

• As soon as I dive, I get out immediately...

Greek often uses the present tense for repeated or typical actions, just like English can say:

• Whenever I go in, I come right back out.

So βγαίνω here does not necessarily mean I am getting out right now. It means I get out / I usually get out.

Because the two parts are doing different jobs.

• Μόλις βουτήξω is a time clause introduced by μόλις, so it takes the subjunctive
• βγαίνω αμέσως... is the main clause, describing what the speaker does habitually, so it uses the present indicative

In other words:

• βουτήξω = dependent clause after μόλις
• βγαίνω = main statement

That mix is completely normal in Greek.

Both involve the subjunctive form, but να is not always expressed in every structure.

With μόλις, Greek normally says:

• μόλις βουτήξω

not:

• μόλις να βουτήξω

So the subjunctive idea is there, but μόλις itself triggers that construction without να.

Literally it means:

• I come out from the water
• more natural English: I get out of the water

Breakdown:

• βγαίνω = I go out / come out / get out
• από = from / out of
• το νερό = the water

So βγαίνω από το νερό is a very natural way to say get out of the water.

Αμέσως means immediately / right away.

Here it modifies βγαίνω:

• βγαίνω αμέσως από το νερό = I get out of the water immediately

Its position is natural and common. Greek word order is flexible, so you may also hear other placements for emphasis, but this version is straightforward and idiomatic.

Because αρέσει works like is pleasing.

So:

• μου αρέσει literally = it is pleasing to me
• natural English = I like it

In this sentence:

• δεν μου αρέσει να μένω...
  literally = it is not pleasing to me to stay...
• natural English = I don’t like staying...

The pronoun μου means to me.

Because after expressions like μου αρέσει / δεν μου αρέσει, Greek normally uses να + verb.

So:

• μου αρέσει να διαβάζω = I like reading
• δεν μου αρέσει να περιμένω = I don’t like waiting
• δεν μου αρέσει να μένω πολύ ώρα βρεγμένος = I don’t like staying wet for a long time

This is a very common pattern in Greek.

This is a very important aspect difference.

• να μένω uses the present subjunctive, which suggests an ongoing state or repeated/continuous action
• να μείνω uses the aorist subjunctive, which suggests a single complete event

Here the speaker means:

• I don’t like being/staying wet for long

That is a continuing state, so να μένω is the natural choice.

If you used να μείνω, it would sound more like to remain / to end up staying as a single whole event, which is less suitable here.

Πολύ ώρα means for a long time.

Greek often uses expressions of duration without a preposition, where English uses for:

• περίμενα πολλή ώρα = I waited for a long time
• δούλεψε δύο ώρες = he worked for two hours
• μένω πολύ ώρα = I stay for a long time

So this is normal Greek structure.

Also note that you may often see:

• πολλή ώρα with feminine adjective agreement

In everyday writing and speech, learners will notice some variation, but the standard form with ώρα is πολλή ώρα.

Βρεγμένος means wet, literally a participial adjective meaning having been wetted.

It agrees with the person being described:

• βρεγμένος = masculine singular
• βρεγμένη = feminine singular
• βρεγμένο = neuter singular
• βρεγμένοι / βρεγμένες / βρεγμένα = plural forms

So the speaker is grammatically masculine here.

If a woman were speaking, she would say:

• δεν μου αρέσει να μένω πολύ ώρα βρεγμένη

Usually it means wet, often from water, rain, swimming, and so on.

In this sentence it fits perfectly because the context is diving into water. So:

• να μένω πολύ ώρα βρεγμένος = to stay wet for a long time

It is a very natural adjective here.

Yes. That is one of the most natural ways to understand it.

Because of the tense choices, the sentence can express a general habit:

• Whenever I dive, I immediately get out of the water, because I don’t like staying wet for long.

That is why the present βγαίνω works so well.

Yes, depending on style.

Possible translations include:

• As soon as I dive, I get out of the water immediately...
• Once I dive, I get out of the water immediately...
• Whenever I dive, I get out immediately...

The exact English wording can vary, but the Greek structure is the same.

The word order is natural, but Greek has some flexibility.

This sentence is arranged clearly:

• time clause first: Μόλις βουτήξω
• main action: βγαίνω αμέσως από το νερό
• reason: γιατί δεν μου αρέσει να μένω πολύ ώρα βρεγμένος

That order is easy to follow and sounds very normal. Greek could rearrange some parts for emphasis, but this version is standard and smooth.

Γιατί here means because.

It introduces the reason:

• γιατί δεν μου αρέσει... = because I don’t like...

Be careful: γιατί can also mean why in questions.

So:

• Γιατί έφυγες; = Why did you leave?
• Έφυγα γιατί κουράστηκα. = I left because I got tired.

In your sentence, it clearly means because.