احنا بنحب نتمشى في الحديقة سوا لما الجو يكون حلو.

Yes. احنا or إحنا means we in Egyptian Arabic.

A few useful notes:

• إحنا / احنا = Egyptian colloquial
• نحن = Modern Standard Arabic

In everyday Egyptian speech, إحنا is what you will hear much more often. Both احنا and إحنا are common spellings in informal writing.

In Egyptian Arabic, بـ on the imperfect verb usually marks the normal present or habitual meaning.

So:

• بنحب = we like / we love
• without بـ, نحب would not normally be the everyday standalone present form in Egyptian

Here, بنحب means something like we like to or we enjoy.

Because after verbs like like, want, can, start, and similar verbs, the next verb is usually used without بـ in Egyptian Arabic.

So:

• بنحب نتمشى = we like to take walks
• not بنحب بنتمشى

This is very common in Egyptian:

• عايز أروح = I want to go
• أقدر أعمل = I can do
• بحب أقرأ = I like to read

So in your sentence, نتمشى is functioning like to walk / to stroll after بنحب.

نتمشى comes from the verb اتمشى / يتمشى, which means to walk around, to take a walk, or to stroll.

It usually suggests a relaxed walk, not just walking for transportation.

So it feels more like:

• take a walk
• go for a walk
• stroll

rather than simply walk in a neutral sense.

It is understandable, but الحديقة sounds a bit more formal or closer to Standard Arabic.

In very natural everyday Egyptian, many speakers would more often say:

• في الجنينة = in the garden / park

So both are understandable, but:

• الحديقة = more formal/neutral
• الجنينة = more everyday Egyptian

Also, في here means in / at, so في الحديقة means in the park/garden, not to the park.

سوا means together.

In this sentence, it tells you that we are doing the walking together.

Its position is fairly flexible. For example, these are all natural:

• بنحب نتمشى سوا
• بنحب نتمشى في الحديقة سوا
• بنحب سوا نتمشى في الحديقة
  less common, but possible in some contexts

Putting سوا near the end, as in your sentence, sounds very natural.

Here لما means when or whenever.

So:

• لما الجو يكون حلو = when the weather is nice
• or more naturally in English, whenever the weather is nice

It introduces a time clause.

A useful comparison:

• لما = when / whenever
• لو = if

In this sentence, لما fits because it refers to the situation in which this usually happens.

That is a very common question.

In simple present statements, Arabic often does leave out is:

• الجو حلو = the weather is nice

But in clauses like when the weather is nice, Egyptian Arabic often uses a form of to be, such as يكون or more colloquially يبقى.

So:

• الجو حلو = the weather is nice
• لما الجو يكون حلو = when the weather is nice

That is why يكون appears here.

Often, yes.

In very everyday Egyptian, many speakers would say:

• لما الجو يبقى حلو

instead of:

• لما الجو يكون حلو

Both are understandable. The difference is mostly about style:

• يكون = fine, clear, a bit more neutral or slightly less colloquial
• يبقى = very common in spoken Egyptian

So your sentence works, but a very conversational version would often use يبقى.

Because الجو is grammatically masculine singular, so the adjective agrees with it.

• الجو = the weather
• حلو = nice/good/pleasant, masculine singular
• حلوة would be feminine singular

So:

• الجو حلو = correct
• الجو حلوة = not correct

A useful approximate pronunciation is:

eḥna benḥebb netmashsha fil-ḥadī'a sawa lamma l-gaww yekūn ḥelw

A few pronunciation notes:

• احنا → eḥna
• بنحب → benḥebb
• نتمشى → netmashsha
• الحديقة in Egyptian is often pronounced with a glottal stop instead of q, so roughly el-ḥadī'a
• الجو → el-gaww
• حلو → ḥelw

If you want an even more everyday Egyptian version, you might hear something like:

eḥna benḥebb netmashsha fil-geneena sawa lamma l-gaww yeb'a ḥelw

A very natural everyday version would be:

إحنا بنحب نتمشى في الجنينه سوا لما الجو يبقى حلو

Differences from your sentence:

• إحنا instead of احنا
  just a spelling variation
• الجنينه instead of الحديقة
  more colloquial
• يبقى instead of يكون
  more conversational Egyptian

Your original sentence is still understandable, but this version sounds more like everyday spoken Egyptian.