Jag går upp tidigt på lördag för att hinna med tåget.

Går upp means get up or wake up and get out of bed.

It is a particle verb:

• gå = go, walk
• gå upp = get up, rise

So Jag går upp tidigt means I get up early.

This is very common in Swedish, and the added particle upp changes the meaning of the basic verb.

Because gå by itself usually means go or walk, not get up.

Compare:

• Jag går till jobbet. = I go / walk to work.
• Jag går upp tidigt. = I get up early.

So in this sentence, upp is necessary. Without it, the meaning would be wrong.

Swedish often uses the present tense for future actions when the time is clear from the context.

Here, på lördag tells you that the action is in the future, so Jag går upp tidigt på lördag naturally means I’m getting up early on Saturday or I will get up early on Saturday.

This is very similar to English:

• I leave tomorrow
• We fly on Friday

So Swedish does not need a special future form here.

In a normal main clause, the finite verb comes early in the sentence, and the particle usually stays after it.

So:

• Jag går upp tidigt.

This is the normal order for many Swedish particle verbs.

You can compare:

• Jag vaknar upp tidigt.
• Hon tar på sig jackan.
• Vi åker iväg imorgon.

The important thing is that gå upp functions as one unit in meaning, even though the two parts are written separately.

Tidigt means early.

It comes from the adjective tidig = early.
Here it is being used as an adverb, so the form is tidigt.

Compare:

• en tidig morgon = an early morning
• Jag vaknar tidigt. = I wake up early.

So:

• tidig = adjective
• tidigt = adverb

Yes. På lördag means on Saturday, usually referring to the coming or relevant Saturday.

Swedish often uses på with days of the week in this kind of time expression:

• på måndag = on Monday
• på fredag = on Friday
• på lördag = on Saturday

It often suggests a specific upcoming day, depending on context.

In Swedish, days of the week normally do not take an article in expressions like this.

So you say:

• på lördag
• på söndag
• på tisdag

Not:

• på en lördag
• på den lördagen
  unless you mean something more specific or unusual.

This is just the standard idiomatic way to say on Saturday.

För att means in order to or simply to, when expressing purpose.

So:

• Jag går upp tidigt på lördag för att hinna med tåget. means:
• I get up early on Saturday in order to catch the train.

It introduces the reason or purpose for getting up early.

Compare:

• Jag pluggar för att klara provet. = I study in order to pass the test.
• Hon skyndar sig för att komma i tid. = She hurries to arrive on time.

Because after för att, Swedish normally uses the infinitive form of the verb.

So:

• att hinna = to have time / to make it in time
• hinner = have time / make it in time in the present tense

Here the structure is:

• för att + infinitive

So:

• för att hinna med tåget = in order to catch the train

Not:

• för att hinner med tåget

Here, hinna med tåget means catch the train or make it in time for the train.

The verb hinna is about having enough time.
The combination hinna med can mean manage to catch, fit in, or keep up with, depending on context.

In this sentence, the meaning is:

• I get up early on Saturday so that I’ll have enough time to catch the train.

A useful comparison:

• Jag hinner äta innan jobbet. = I have time to eat before work.
• Jag hinner med tåget. = I make it in time for the train / I catch the train.

Tåget means the train.

The definite form is used because the speaker has a specific train in mind — for example, the train they need to take on Saturday.

Compare:

• ett tåg = a train (any train, not specific)
• tåget = the train (a specific one)

In this sentence, the meaning is naturally specific:

• the train I need to catch

Not very naturally.

A very literal translation would be:

• I get up early on Saturday in order to make it with the train.

But that sounds odd in English.

A natural English translation would be:

• I’m getting up early on Saturday to catch the train.
• I get up early on Saturday to catch the train.
• I will get up early on Saturday to catch the train.

So the Swedish structure is normal, but the most natural English translation is a bit less literal.