Kalau hujan belum reda, saya mau tidak mau naik taksi ke stasiun.

Yes. In this sentence, kalau means if:

Kalau hujan belum reda, ... = If the rain hasn’t let up, ...

A few useful notes:

• kalau is very common in everyday Indonesian.
• It can also mean when in some contexts, depending on meaning.
• A more formal alternative is jika.

So:

• Kalau hujan belum reda... = natural, conversational
• Jika hujan belum reda... = a bit more formal

Both are correct here.

It means the rain has not subsided yet or the rain hasn’t let up yet.

Breakdown:

• hujan = rain
• belum = not yet
• reda = to subside, die down, ease off

So hujan belum reda is not just it is raining, but more specifically the rain is still going on / hasn’t eased up yet.

That gives the sentence a slightly more natural weather-related nuance than simply saying the rain has not stopped.

Because belum means not yet, while tidak means plain not.

So:

• hujan belum reda = the rain hasn’t subsided yet
• hujan tidak reda = the rain does not subside / is not subsiding

In this sentence, the speaker is talking about a situation that may change soon, so belum is the natural choice.

English speakers often need to get used to this distinction:

• tidak = not
• belum = not yet

Reda means something like to subside, to die down, or to let up.

For rain:

• hujan belum reda = the rain hasn’t eased up yet
• hujan belum berhenti = the rain hasn’t stopped yet

These are similar, but not identical:

• reda focuses on the intensity going down
• berhenti focuses on the action stopping completely

In real life, both can work, but hujan belum reda sounds very natural when talking about ongoing rain that is still strong enough to affect your plans.

Yes, literally it is want, not want, but as an expression it means:

• whether I want to or not
• like it or not
• I have no choice but to ...

So:

saya mau tidak mau naik taksi
= whether I want to or not, I have to take a taxi
= I have no choice but to take a taxi

This is a fixed expression, and it is very common.

They are close, but not exactly the same.

• harus = must / have to
• mau tidak mau = whether one wants to or not; there is no real choice

Compare:

• Saya harus naik taksi. = I have to take a taxi.
• Saya mau tidak mau naik taksi. = I have no choice but to take a taxi.

The second one emphasizes unwillingness or lack of alternatives more strongly. It often sounds more expressive.

Literally, naik can mean go up or rise, but in Indonesian it is also the normal verb for riding / taking a form of transportation.

So:

• naik bus = take the bus
• naik kereta = take the train
• naik taksi = take a taxi
• naik pesawat = take a plane

This is very standard Indonesian.

English speakers sometimes expect a verb like take, but Indonesian often uses naik for transport.

Because ke is the preposition meaning to or toward a place.

So:

• ke stasiun = to the station
• ke kantor = to the office
• ke rumah = to the house/home

In this sentence:

naik taksi ke stasiun = take a taxi to the station

That is the normal way to express movement toward a destination.

Because Indonesian often does not need an explicit future marker when the context already makes the time clear.

Here, the condition introduced by kalau already shows that this is about a possible future situation:

Kalau hujan belum reda, saya mau tidak mau naik taksi ke stasiun.

This naturally means something like: If the rain hasn’t let up, I’ll have no choice but to take a taxi to the station.

You could say akan naik taksi, but it is often unnecessary. Indonesian frequently leaves future meaning to context.

In the first clause, hujan itself is the subject:

hujan belum reda = the rain has not subsided yet

Then in the second clause, the subject changes to saya:

saya mau tidak mau naik taksi = I have no choice but to take a taxi

So the structure is:

• condition: Kalau hujan belum reda
• main clause: saya mau tidak mau naik taksi ke stasiun

This is completely normal. Indonesian does not need extra words like it in weather expressions the way English often does.

Yes. Indonesian often allows the condition clause to come first or second.

Original: Kalau hujan belum reda, saya mau tidak mau naik taksi ke stasiun.

Also possible: Saya mau tidak mau naik taksi ke stasiun kalau hujan belum reda.

Both are grammatical.

The version with kalau first is often clearer and more natural when you want to present the condition before the result.

Yes, it sounds natural.

It is especially natural because of these combinations:

• kalau for a common conditional
• hujan belum reda for rain that has not eased up yet
• mau tidak mau for lack of choice
• naik taksi for taking a taxi

So this is a good example of everyday Indonesian that a learner is likely to hear or use.