غدا غائم.

A careful MSA pronunciation is ghadan ghā’im.

A few notes:

• غدًا = ghadan = tomorrow
• غائم = ghā’im = cloudy

The غ is a deep throaty sound, often approximated as gh in transliteration.

The word غائم contains a hamza (ء), so there is a slight break between the two vowels: ghā-im, not one smooth syllable.

If full case endings are pronounced, it is:

• غدًا غائمٌ
• ghadan ghā’imun

At the end of a sentence, Arabic often pauses, so the final -un is usually not heard.

Because the fully vowelled form is غدًا, not just غدا in the sense of a long final ā.

That final ا is the written alif that often appears with tanwīn fatḥ (-an) in Arabic spelling. It helps represent the accusative ending in writing, but the word is pronounced ghadan.

So:

• غدًا = ghadan = tomorrow

This is a very common thing in Arabic spelling, and it often confuses learners at first.

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

So:

• غدا غائم literally looks like Tomorrow cloudy
• but it naturally means Tomorrow is cloudy or It will be cloudy tomorrow, depending on context

This is normal Arabic grammar. In nominal sentences, the present-tense copula is usually omitted.

Here غدًا is a time expression—more specifically, an adverbial accusative of time (ظرف زمان).

It tells you when the cloudy weather applies:

• غدًا = tomorrow

So it is not the subject of the sentence in the same way tomorrow might feel in English. It is setting the time frame.

غائم means cloudy or overcast.

It is commonly used in weather language. In this sentence, it functions as the predicate describing the weather/sky.

You will often see it in weather reports such as:

• الجو غائم = The weather is cloudy
• يكون الطقس غائمًا = The weather is cloudy / will be cloudy

Because Arabic weather expressions often use an understood noun such as:

• الجو = the atmosphere / weather
• الطقس = the weather

Both are masculine singular.

So غدا غائم is a short way of saying something like:

• غدًا الجو غائمٌ
• Tomorrow, the weather is cloudy

That is why غائم appears in the masculine singular form.

The fully vowelled sentence is:

• غدًا غائمٌ

Why?

• غدًا takes fatḥatayn (-an) because it is an adverbial expression of time, so it is in the accusative.
• غائمٌ takes ḍammatayn (-un) because it is the predicate of a nominal sentence, so it is nominative.

In normal pause at the end of a sentence, the final tanwīn on غائمٌ is usually not pronounced, so you will often hear ghadan ghā’im.

It is a complete sentence in normal Arabic usage, especially in short statements and weather-style language.

Arabic often leaves predictable words unstated. Here, something like الجو or الطقس is understood.

So although a learner might expect a fuller sentence, غدا غائم is perfectly natural as a concise statement.

Yes. For a beginner, these may feel clearer:

• الجو غائم غدًا = The weather is cloudy tomorrow
• سيكون الجو غائمًا غدًا = The weather will be cloudy tomorrow
• غدًا سيكون الجو غائمًا = Tomorrow the weather will be cloudy

These versions make the hidden subject explicit and may be easier to understand at first.

The original غدا غائم is shorter and sounds a bit like forecast language or a concise statement.

Yes. Arabic word order is flexible, especially with time expressions.

Possible versions include:

• غدًا غائمٌ
• الجو غائمٌ غدًا
• غدًا الجو غائمٌ
• سيكون الجو غائمًا غدًا

Starting with غدًا puts emphasis on the time: as for tomorrow...

So the given sentence is natural if the speaker wants to foreground tomorrow.

Yes. Without vowel marks, غدا can be ambiguous in writing.

Depending on context, it may relate to other words or forms, but in this sentence the meaning is clearly غدًا = tomorrow because it is followed by غائم and forms a weather statement.

So context is what tells you how to read it.

For this sentence, the correct reading is:

• غدًا غائمٌ
• Tomorrow is cloudy / It will be cloudy tomorrow