المطر كتير في الشتا.

In Egyptian Arabic, present-tense sentences often do not use a word for is / are.

So المطر كتير في الشتا is literally something like:

the rain — a lot — in the winter

But naturally it means:

There is a lot of rain in the winter
or
It rains a lot in the winter

This is a very normal Arabic pattern called a nominal sentence.

كتير means a lot / much / many in Egyptian Arabic.

In this sentence, it works like a lot:

• المطر كتير = There is a lot of rain / It rains a lot

In Egyptian, كتير is very common in everyday speech and can be used in a lot of contexts:

• بحبه كتير = I like it a lot
• في ناس كتير = There are many people
• الشغل كتير = There is a lot of work

Arabic often uses the definite article الـ with nouns when speaking about something in a general category.

So المطر here does not necessarily mean one specific rainstorm. It can mean rain in a general sense.

That is why المطر كتير في الشتا can mean:

Rain is abundant in winter
or more naturally,
It rains a lot in the winter

This is different from English, where we often use a bare noun like rain without the.

في usually means in, and الشتا means winter in Egyptian Arabic.

So في الشتا literally means in the winter.

In natural English, it can also be understood as:

• in winter
• during the winter

So the whole sentence is talking about what happens during wintertime.

Yes, الشتا is the Egyptian Arabic form.

In Modern Standard Arabic, you would usually say الشتاء.

So:

• Egyptian: المطر كتير في الشتا
• MSA-ish version: المطر كثير في الشتاء

Also notice:

• Egyptian uses كتير
• MSA uses كثير

A learner should recognize that this sentence is clearly Egyptian colloquial, not formal written Arabic.

In الشتا, the ش is a sun letter, so the ل of الـ is not pronounced fully.

So instead of saying el-sheta, you say something closer to:

ish-shita or esh-sheta, depending on the speaker and transcription style.

That doubling of sh sound is important.

So:

• الشتا → pronounced roughly ish-shita / esh-sheta

By contrast, in المطر, the م is a moon letter, so the ل is pronounced:

• المطر → el-maṭar or il-maṭar

The basic order here is:

المطر — topic
كتير — comment about it
في الشتا — time phrase

So the sentence is structured like:

Rain is abundant in the winter

This order is very natural in Egyptian Arabic.

You can sometimes move في الشتا earlier for emphasis, for example:

في الشتا المطر كتير

That would still be understandable, but the original version is the more neutral one.

No. In Egyptian Arabic, كتير usually stays the same in this kind of everyday usage.

So you do not change it to match المطر.

That is one reason learners find كتير convenient: it is very flexible and commonly used as a kind of general a lot / much / many word in speech.

Yes. That is a very natural English translation.

Even though the Arabic sentence does not literally contain a verb like rain, Arabic often expresses this idea with a noun phrase:

المطر كتير في الشتا
literally: The rain is a lot in the winter

But in natural English, the best translation is often:

It rains a lot in the winter

So this is a good example of a sentence that should be translated by meaning, not word-for-word.

Yes, it sounds natural and conversational.

An Egyptian speaker could definitely say:

المطر كتير في الشتا

Other natural Egyptian ways to express a similar idea include:

• بتمطر كتير في الشتا = It rains a lot in the winter
• الدنيا بتمطر كتير في الشتا = It rains a lot in the winter / The weather is rainy a lot in winter

So your sentence is natural, especially as a simple statement about winter weather.

A rough pronunciation is:

il-maṭar kitīr fi-sh-shita

or, depending on accent/transcription style:

el-matar kteer fish-sheta

A few notes:

• المطر → il-maṭar / el-matar
• كتير → kitīr / kteer
• في الشتا → often sounds like fish-shita / fish-sheta in connected speech

That happens because في ends right before الشتا, and الـ assimilates to ش, giving the doubled sh sound.