السطح اهدى من الشارع بالليل.

A natural Egyptian pronunciation would be:

es-saṭḥ ahda men esh-shāreʿ bil-lēl

A few notes:

• السطح → es-saṭḥ
  The ل of ال blends into the س.
• اهدى → ahda
• من → often men in Egyptian speech
• الشارع → esh-shāreʿ
  Again, the ل of ال blends into the ش.
• بالليل → bil-lēl or bel-lēl, depending on the speaker

Because Arabic usually leaves out is/am/are in the present tense.

So:

• السطح اهدى من الشارع
  literally = the roof quieter than the street
• natural English = The roof is quieter than the street

This is very normal in both Egyptian Arabic and Standard Arabic.

If you wanted was, then you would normally use كان:

• السطح كان اهدى من الشارع
  = The roof was quieter than the street

In Egyptian Arabic, السطح usually means the roof or the rooftop of a building.

Very often in Egypt, السطح suggests a roof area you can actually go up to, not just the top outside surface in an abstract sense. Depending on context, English might translate it as:

• the roof
• the rooftop
• sometimes the terrace or roof area

So in this sentence, it probably means the rooftop space is quieter than the street at night.

اهدى means quieter or calmer, depending on context.

It comes from the adjective هادي, which means:

• quiet
• calm

So:

• هادي = quiet/calm
• اهدى = quieter/calmer

In this sentence, because it is comparing a rooftop and a street, quieter is the most natural English meaning.

من is the word used for than in comparisons.

So the pattern is:

X + comparative adjective + من + Y

In this sentence:

• السطح = the roof
• اهدى = quieter
• من الشارع = than the street

So:

السطح اهدى من الشارع
= The roof is quieter than the street

You will see the same pattern in many other comparisons:

• أحسن من = better than
• أكبر من = bigger than
• أسرع من = faster than

In casual Arabic writing, people often leave out the written hamza at the beginning of a word.

So you may see:

• اهدى
• أهدى

Both are meant to represent the same word here.

If someone is writing more carefully, they may prefer أهدى. But in everyday texting and informal writing, dropping the hamza is extremely common.

Because the sentence is talking about specific, understood places:

• السطح = the roof
• الشارع = the street

This is very natural in Arabic. Often the speaker means the roof and the street connected to the place they are talking about, even if English might sometimes sound okay with a more general phrasing.

So the sentence feels like:

• the rooftop here
• the street outside

rather than just any roof and any street.

In this comparative structure, words like اهدى usually stay in the same comparative form.

So even if the noun is feminine, you still commonly use the same comparative form:

• الأوضة اهدى من الصالة
  = The room is quieter than the living room

This is similar to other comparatives in Arabic:

• أكبر = bigger
• أحسن = better
• أسرع = faster

They do not usually change the way ordinary adjectives do in this kind of sentence.

Because ش is a sun letter.

With sun letters, the ل of ال is not pronounced separately. Instead, it merges into the next consonant.

So:

• الشارع is written with ال
• but pronounced esh-shāreʿ, with a doubled sh sound

The same thing happens in السطح:

• written السطح
• pronounced es-saṭḥ

This is one of the most important pronunciation patterns in Arabic.

بالليل means at night or during the night.

In Egyptian Arabic, بـ is very commonly used in time expressions like this:

• بالليل = at night
• بالنهار = in the daytime / during the day

So بالليل sounds very natural in Egyptian speech.

You can also hear في الليل, especially in more formal Arabic or in speech that leans toward Standard Arabic, but بالليل is especially common and natural in Egyptian.

The given order is natural, but Arabic does allow some flexibility.

These are all possible, depending on emphasis:

• السطح اهدى من الشارع بالليل
• بالليل السطح اهدى من الشارع

The original sentence sounds like a neutral statement, with بالليل added at the end to set the time.

If you put بالليل first, it gives more emphasis to at night.

So yes, the word order can change a bit, but the original sentence is perfectly natural.