هناك مطر خلال الرحلة في المخيم.

In this sentence, هناك is being used in an existential way, like English there is / there are.

So هناك مطر means there is rain.

This is a very common Arabic pattern:

• هناك مشكلة = there is a problem
• هناك طفل = there is a child
• هناك مطر = there is rain

In other contexts, هناك can also literally mean there / over there, but here its job is grammatical: it introduces the existence of something.

In Arabic, the present-tense copula is usually omitted. English needs is in there is rain, but Arabic often does not.

So:

• هناك مطر literally looks like there rain
• but it naturally means there is rain

If you want past or future, Arabic usually adds a verb:

• كان هناك مطر = there was rain
• سيكون هناك مطر = there will be rain

So the lack of is is completely normal in Modern Standard Arabic.

After existential هناك, Arabic usually introduces something indefinite.

So:

• هناك مطر = there is rain
• هناك رجل = there is a man

Using المطر would sound less natural in a basic existential sentence, because الـ usually points to something already known or specifically identified.

This is similar to English:

• There is rain sounds natural.
• There is the rain usually does not.

So مطر is indefinite because the sentence is simply stating the existence of rain.

خلال means during.

So:

• خلال الرحلة = during the trip

Grammatically, خلال is followed by a noun in the genitive:

• خلالَ الرحلةِ

With full case endings, that part would be written:

• خلالَ الرحلةِ

In normal unvocalized writing, those endings are usually not shown, so you just see:

• خلال الرحلة

الرحلة has الـ, so it means the trip, not just a trip.

Arabic uses الـ when the noun is:

• already known from context
• specific
• understood by speaker and listener

So:

• خلال الرحلة = during the trip
• خلال رحلة = during a trip

A learner may wonder whether both are possible. Yes, both are possible, but they mean different things. The sentence you were given refers to a specific trip.

في المخيم means in the camp / at the camp and gives location.

So the sentence contains:

• an existential part: هناك مطر
• a time phrase: خلال الرحلة
• a place phrase: في المخيم

A common learner question is: what exactly does في المخيم attach to?

The answer is that Arabic allows this kind of phrase, but the sentence can feel a bit ambiguous:

• Is the rain in the camp?
• Is the trip happening in the camp?
• Is the whole event located at the camp?

Usually the context tells you.

It is understandable, but many native speakers might feel it is a little unclear or awkward, mainly because of how the two prepositional phrases are stacked:

• خلال الرحلة
• في المخيم

The issue is not grammar so much as clarity.

Depending on the intended meaning, Arabic might more naturally say:

• هناك مطر في المخيم خلال الرحلة
• كان هناك مطر أثناء الرحلة إلى المخيم
• هطل المطر خلال الرحلة في المخيم

So the original sentence is possible, but a learner should know that native speakers often rearrange it to make the relationships clearer.

Yes. أثناء and خلال can both mean during.

For example:

• أثناء الرحلة
• خلال الرحلة

Both are correct in Modern Standard Arabic. In many contexts, they are very close in meaning. Sometimes one may sound more natural than the other depending on style, but for most learners they are interchangeable in sentences like this.

With full case endings, the sentence would be:

هناك مطرٌ خلالَ الرحلةِ في المخيمِ

Breakdown:

• مطرٌ: nominative, because it is the noun being asserted to exist
• خلالَ: often treated as an adverbial/prepositional word in the accusative form
• الرحلةِ: genitive after خلال
• المخيمِ: genitive after في

In normal Arabic writing, these endings are usually omitted, so learners usually see: هناك مطر خلال الرحلة في المخيم

Yes. Arabic word order is fairly flexible, especially with prepositional phrases.

For example, you could see:

• هناك مطر في المخيم خلال الرحلة
• في المخيم هناك مطر خلال الرحلة

Changing the order can change the focus slightly:

• putting في المخيم earlier can emphasize location
• putting خلال الرحلة earlier can emphasize time

However, not every order sounds equally natural in every context. Native speakers usually choose the order that makes the meaning easiest to follow.

You would normally add كان:

• كان هناك مطر خلال الرحلة في المخيم = there was rain during the trip at the camp

Without كان, the sentence is usually understood as present, general, or context-dependent.

This is an important pattern:

• هناك... = there is / there are
• كان هناك... = there was / there were
• سيكون هناك... = there will be

So if the English meaning is clearly in the past, Arabic usually makes that explicit with كان.