Kampüs yolunda nem çok yüksekti; hatta gökyüzü kapalıydı.

Because kampüs yolu is a noun compound: literally campus road / road to the campus.

• kampüs = campus
• yol = road, way
• kampüs yolu = campus road / road to campus

In Turkish, the second noun in this kind of compound usually takes a possessive-looking ending:

• yol → yolu

Then the locative ending -da / -de is added:

• kampüs yolu
  • -nda → kampüs yolunda

So kampüs yolunda means on the campus road or sometimes on the way to campus, depending on context.

Kampüs yolda would not be correct here.

It is the locative case, which usually means in, on, at.

So here:

• yolunda = on the road / on the way

In this sentence, it tells you the location or setting where the condition is being described.

That n is a buffer consonant.

The form breaks down like this:

• kampüs yolu = the campus road
• kampüs yolu-n-da

That n appears before some case endings when a noun already has a possessive ending. It helps the word sound natural and keeps the parts from running together awkwardly.

Yes. Turkish uses yüksek (high) very naturally with things like levels, amounts, rates, and measurements, including humidity.

So:

• nem yüksekti = the humidity was high
• nem düşüktü = the humidity was low

This is very similar to English.

Yüksekti is:

• yüksek = high
• idi = was

These combine into:

• yüksek + idi → yüksekti

So yüksekti means was high.

This is a very common pattern in Turkish:

• mutluydu = was happy
• soğuktu = was cold
• zordu = was difficult

Because Turkish does not need a dummy subject like English it in weather-style statements.

English says:

• It was humid
• It was cold

But Turkish usually just states the condition directly:

• Nem çok yüksekti = The humidity was very high

Also, the idea of was is already included in yüksekti, so no separate verb is necessary.

Because çok means very here, and in Turkish it normally comes before the adjective or adverb it modifies.

So:

• çok yüksek = very high
• çok güzel = very beautiful
• çok hızlı = very fast

That is why you get:

• nem çok yüksekti = the humidity was very high

Hatta adds an extra point that strengthens what came before. Depending on context, it can be translated as:

• in fact
• actually
• even

In this sentence, it works like: in fact / even — introducing another detail that makes the atmosphere seem even heavier or gloomier.

So it connects the two ideas like this:

• the humidity was very high;
• in fact / even, the sky was overcast.

Literally, kapalı often means closed or shut.

But with weather or the sky, it commonly means:

• overcast
• cloudy
• covered

So:

• gökyüzü kapalıydı = the sky was overcast

This is a very common weather expression in Turkish.

It is:

• kapalı = closed / overcast
• idi = was

Together:

• kapalı + idi → kapalıydı

The y is a buffer letter added because kapalı ends in a vowel. Turkish often inserts y between vowels to make pronunciation smoother.

Because gökyüzü is a standard Turkish compound noun meaning sky.

It comes from:

• gök = sky, heavens
• yüzü = face, surface

Historically, it is something like the face of the sky, but in modern Turkish it is simply the normal word gökyüzü = sky.

Learners usually just memorize it as a single vocabulary item.

The semicolon links two closely related clauses without making them fully separate sentences.

Here it shows that the second clause adds a related supporting detail:

• Kampüs yolunda nem çok yüksekti;
• hatta gökyüzü kapalıydı.

So the punctuation helps show: these are two connected observations about the same atmosphere or scene.

A full stop could also work, but the semicolon makes the connection feel tighter.

Yes. Turkish word order is flexible, although different orders create different emphasis.

The given sentence starts with the setting:

• Kampüs yolunda ...

This sounds natural because it first tells you where the description applies.

You could rearrange parts, but the emphasis would shift. For example:

• Nem kampüs yolunda çok yüksekti.

This is still understandable, but it sounds less natural in many contexts than starting with the location phrase. The original order is smooth and typical.