Leo mchana, joto ni kali sana, kwa hiyo tunakaa ndani ya nyumba.

Literally, it is today daytime/noon.

In natural English, leo mchana can mean:

• this afternoon
• today during the day
• sometimes today at noon, depending on context

So mchana is broader than just one exact clock time. It often refers to the daytime period.

Swahili usually does not need a dummy subject like English it.

English says:

• It is hot

But Swahili often uses a real noun instead:

• joto ni kali = literally the heat is intense

So instead of an empty subject like it, Swahili talks about joto (heat).

Joto means heat or hotness.

In weather sentences, Swahili commonly talks about heat rather than using a structure exactly like English it is hot. So:

• joto ni kali = the heat is strong/intense
• natural meaning: it is very hot

This is a very normal way to describe hot weather in Swahili.

Yes — and that is exactly why it works here.

Kali has a wider meaning than one single English word. It can mean:

• strong
• intense
• harsh
• severe
• sharp, in some contexts

So joto ni kali is literally something like the heat is intense/severe, which is a natural Swahili way to say it is very hot.

Ni is the copula here — the word that works like is/are in English.

So:

• joto = heat
• ni = is
• kali sana = very intense

Together:

• joto ni kali sana = the heat is very intense

Sana means very.

So:

• kali = intense/strong
• kali sana = very intense

It strengthens the adjective, just like very in English.

Kwa hiyo means:

• so
• therefore
• for that reason
• that’s why

It is very common and natural.

Literally, it is something like because of that / by that, but in normal use you should think of it as a connector meaning so or therefore.

Because the subject we is already built into the verb.

Breakdown:

• tu- = we
• -na- = present tense
• kaa = stay/sit/live

So tunakaa already means we are staying / we stay.

You can say sisi tunakaa if you want extra emphasis on we, but it is not necessary.

It can mean different things depending on context:

• sit
• stay
• live
• remain

In this sentence, tunakaa ndani ya nyumba means we stay inside the house.

So here it does not mean we are sitting inside the house unless the context specifically suggests sitting.

It breaks down like this:

• tu- = we
• -na- = present tense marker
• -kaa = verb stem from kukaa (to stay / sit / live)

So:

• tunakaa = we stay / we are staying

This is a very useful pattern in Swahili:

• ni-na-soma = I am reading
• u-na-soma = you are reading
• tu-na-soma = we are reading

Literally, it means inside of the house.

Breakdown:

• ndani = inside, interior
• ya = of
• nyumba = house/home

So:

• ndani ya nyumba = inside the house

This is a common Swahili structure:

• mbele ya nyumba = in front of the house
• nyuma ya nyumba = behind the house
• juu ya meza = on top of the table

Ya links ndani to nyumba.

It is part of a very common possessive/connecting pattern that often corresponds to English of.

So:

• ndani ya nyumba = inside of the house

Even though English often just says inside the house, Swahili commonly uses this connector.

Yes, but the meaning is slightly different.

• nyumbani = at home / at the house
• ndani ya nyumba = inside the house

So ndani ya nyumba is more specific. It emphasizes being indoors, not just at home.

For this sentence, ndani ya nyumba fits well because the idea is that it is hot, so we stay inside.

Because Swahili normally does not have articles like English a/an/the.

So:

• nyumba can mean a house, the house, or house/home, depending on context
• joto can mean heat or the heat, depending on context

You understand which one is meant from the situation, not from an article.

Yes, but it is also somewhat flexible.

This sentence starts with Leo mchana to set the time first:

• Leo mchana, joto ni kali sana, kwa hiyo tunakaa ndani ya nyumba.

That is very natural. It is like saying:

• This afternoon, it is very hot, so we are staying inside the house.

Swahili often puts time expressions near the beginning of the sentence, especially when they set the scene.