Kami ingin berlibur singkat ke pantai pada September kalau cuaca bagus.

Kami and kita both mean we, but they are not interchangeable.

• kami = we, excluding the listener
• kita = we, including the listener

So kami ingin... means the speaker and some other people want to do this, but the person being spoken to is not included. If the listener is part of the plan, kita would be more appropriate.

Ingin means want or want to.

In Indonesian, you do not need a separate word like English to before another verb. So:

• ingin berlibur = want to go on vacation / want to take a holiday

The pattern is simply:

• ingin + verb

Berlibur means to go on vacation, to take a holiday, or to vacation.

It comes from libur, which is related to a holiday, a day off, or being off from work/school. With the prefix ber-, it becomes a verb meaning to engage in that activity.

So:

• libur = holiday / off day / be off
• berlibur = to take a holiday

The prefix ber- often forms intransitive verbs, especially verbs meaning:

• to do an activity
• to have something
• to be engaged in something

In berlibur, it turns the base idea libur into the activity to go on vacation / to holiday.

You do not need to translate ber- by itself every time. It is better to learn the whole word berlibur as a unit.

Singkat means short. Here it describes the vacation as being short.

In Indonesian, adjectives often come after the word they describe. In this sentence, berlibur singkat is understood as to take a short vacation.

This is understandable and acceptable, but some speakers might find these alternatives a little more natural:

• liburan singkat = a short vacation
• berlibur sebentar = to vacation briefly / for a short time

So the original wording is fine, but it is not the only natural option.

Because ke shows movement toward a place.

• ke pantai = to the beach
• di pantai = at/on the beach

Since the sentence is about going somewhere for a vacation, ke is the correct choice.

Pada is often used for time expressions, especially in more careful or formal Indonesian.

So:

• pada September = in September

Other common alternatives are:

• di bulan September
• pada bulan September
• sometimes just September, if the context is clear

In everyday speech, people may choose several different versions, but pada September is perfectly correct.

Kalau means if and is very common in everyday Indonesian.

Other options include:

• jika = if, more formal
• bila = if, also somewhat formal/literary

So:

• kalau cuaca bagus sounds natural and conversational
• jika cuaca bagus would sound a bit more formal

For weather, bagus is the more natural choice.

• cuaca bagus = good weather / nice weather

Baik often means good in a broader sense, such as morally good, well-behaved, or satisfactory in a more abstract way. It is not usually the first choice for describing weather.

You might also hear:

• cuacanya bagus

The -nya makes it sound a bit more specific, like the weather or the weather conditions.

Indonesian usually does not use articles like English a, an, or the.

So:

• pantai can mean a beach, the beach, or just beach
• cuaca can mean weather or the weather

The exact meaning depends on context. This is very normal in Indonesian.

Indonesian does not change verbs for tense the way English does.

Future meaning here comes from context:

• ingin shows a plan or intention
• pada September gives a future time
• kalau cuaca bagus gives a condition for that future plan

So even without a special future verb form, the meaning is clearly about a future possibility.

Yes. A very natural alternative is:

Kalau cuaca bagus, kami ingin berlibur singkat ke pantai pada September.

This puts the condition first:

• Kalau cuaca bagus = if the weather is good

Both orders are correct. Starting with the kalau clause puts more emphasis on the condition.