बारिश की वजह से बस देर से आएगी।

A natural breakdown is:

• बारिश = rain
• की वजह से = because of, due to
• बस = bus
• देर से = late, after a delay
• आएगी = will come / will arrive

So the sentence structure is basically:

Because of rain + the bus + late + will arrive

Hindi often puts the reason first and the verb at the end.

की वजह से is a very common Hindi expression meaning because of or due to.

The key noun here is वजह, which means reason or cause.
So the pattern is:

• X की वजह से = because of X

Examples:

• बारिश की वजह से = because of rain
• ट्रैफिक की वजह से = because of traffic
• काम की वजह से = because of work

It is best learned as a chunk: की वजह से.

Because वजह is a feminine noun.

In Hindi, the possessive marker before a noun agrees with the noun that follows. Since वजह is feminine singular, the form used is की:

• की वजह = reason/cause of ...
• की वजह से = because of ...

So even with different words before it, you usually see की वजह से because वजह itself is feminine.

Compare:

• बारिश की वजह से
• काम की वजह से
• उसकी वजह से

This is about agreement with वजह, not with बारिश.

In Hindi, देर से is the normal adverbial expression for late or after a delay.

So:

• देर = delay, lateness
• देर से = late

This is one of those expressions where से is just part of the standard phrase. English speakers often expect a single word for late, but Hindi commonly uses देर से.

For example:

• वह देर से आया। = He came late.
• ट्रेन देर से चली। = The train left late.

Just देर by itself would usually sound incomplete in this kind of sentence.

Because Hindi normally follows Subject-Object-Verb word order, and the main verb usually comes at the end of the clause.

In this sentence:

• बारिश की वजह से = reason phrase
• बस = subject
• देर से = adverbial phrase
• आएगी = verb

So the overall order is very natural for Hindi: Because of rain, the bus late will-arrive.

English usually places the verb earlier, but Hindi tends to save it for the end.

Because बस is feminine in Hindi, and the future verb agrees with it.

Here:

• बस = feminine singular
• आएगी = feminine singular future form of आना (to come)

Compare:

• बस आएगी। = The bus will come.
• ट्रक आएगा। = The truck will come.
  (because ट्रक is usually treated as masculine)

So the -गी ending shows feminine singular agreement.

Yes. In standard Hindi, बस is treated as a feminine noun.

That is why you get:

• बस आई
• बस आएगी
• नई बस

This is something learners often just need to memorize, because grammatical gender in Hindi does not always match anything logical in English. Even loanwords like बस get assigned a gender.

Because Hindi generally does not use articles like a and the the way English does.

So बस can mean:

• a bus
• the bus

The context tells you which one is meant.

If Hindi wants to make something explicitly one/a, it can use एक:

• एक बस देर से आएगी। = A bus will arrive late.

But in many ordinary sentences, no article is used at all.

Yes. A very common alternative is:

बारिश के कारण बस देर से आएगी।

Here, के कारण also means because of / due to.

The difference is mostly one of style:

• की वजह से = very common, natural, everyday
• के कारण = also common, but often a little more formal or written

Notice the grammar difference:

• वजह is feminine, so की वजह से
• कारण is masculine, so के कारण

Both sentences are correct.

It can be understood as either, depending on context.

In everyday English, when talking about transport, बस आएगी is often best translated as:

• the bus will come or
• the bus will arrive

Hindi आना is very broad and often covers both ideas.

आएगी is usually pronounced roughly like aa-eh-gee, often written in Roman script as aayegi.

A simple pronunciation guide for the whole sentence:

baarish kii vajah se bas der se aayegii

A few helpful points:

• बारिश = baa-rish
• वजह = va-jah or wa-jah
• आएगी = aa-eh-gee

You do not need to pronounce every written vowel separately in a stiff way; in natural speech it flows smoothly.

That mark is called the danda. It is the Hindi equivalent of a full stop / period.

So:

• । = .

In modern Hindi, especially online, people also sometimes use the regular English period, but । is the traditional standard punctuation mark.

Yes, to some extent. Hindi word order is more flexible than English, though some orders sound more natural than others.

The original sentence:

• बारिश की वजह से बस देर से आएगी।

You could also say:

• बस बारिश की वजह से देर से आएगी।

That version puts more focus on बस first. Both are natural.
What usually stays the same is that the verb आएगी comes near the end.

So Hindi allows some movement for emphasis, but not complete freedom.