Nawet jeśli mamy własny plan na weekend, czasem zmieniamy go z powodu pogody.

Nawet jeśli means even if.

• jeśli = if
• nawet = even

So Nawet jeśli mamy własny plan na weekend... means Even if we have our own plan for the weekend...

It introduces a condition that does not necessarily change the main result.

Both verbs are in the 1st person plural: we have, we change.

• mamy comes from mieć = to have
• zmieniamy comes from zmieniać = to change

The ending -my is a very common marker for we in the present tense:

• mam = I have
• masz = you have
• ma = he/she/it has
• mamy = we have

And similarly:

• zmieniam = I change
• zmieniamy = we change

Yes, swój plan is also possible, and in many contexts it would sound very natural.

The difference is roughly this:

• własny = one’s own, with emphasis on possession or individuality
• swój = reflexive one’s own, very common in Polish when the owner is the subject

So:

• mamy własny plan = we have our own plan
• mamy swój plan = we have our own plan / we have a plan of our own

In this sentence, własny adds a slight sense of our personal, independent plan.

In Polish, plan na coś means a plan for something.

So:

• plan na weekend = a plan for the weekend
• plan na wakacje = a plan for the holidays/vacation
• pomysł na obiad = an idea for dinner

The preposition na here takes the accusative case.

Since weekend is masculine singular, the accusative form is the same as the nominative here:

• weekend → na weekend

Not visibly, even though it is in the accusative.

That is because weekend is a masculine inanimate noun, and in the singular its accusative often looks the same as the nominative.

So:

• nominative: weekend
• accusative: weekend

That is why you see na weekend, not a different-looking form.

Because Nawet jeśli mamy własny plan na weekend is a subordinate clause, and in Polish such clauses are normally separated by a comma.

So the structure is:

• subordinate clause: Nawet jeśli mamy własny plan na weekend
• main clause: czasem zmieniamy go z powodu pogody

Polish uses commas with subordinate clauses more consistently than English does.

Czasem means sometimes.

Yes, czasami would also work here:

• czasem zmieniamy go...
• czasami zmieniamy go...

Both are natural. Czasem is just a bit shorter and often feels slightly more neutral or compact.

Because the sentence describes something that happens sometimes, as a repeated or general habit.

• zmieniać = imperfective = ongoing, repeated, habitual to change
• zmienić = perfective = complete a single change

So:

• czasem zmieniamy go = sometimes we change it
• zmienimy go would mean more like we will change it or in some contexts we’ll end up changing it

Imperfective is the natural choice when talking about repeated behavior.

Go refers to plan.

So:

• plan = plan
• zmieniamy go = we change it

Here go is the pronoun it/him in the appropriate form. Since plan is masculine, go is the normal pronoun used here.

Both can refer to him/it, but go is usually the unstressed, more neutral form in a sentence like this.

• zmieniamy go = the normal, everyday way to say we change it
• zmieniamy jego would usually sound emphasized or contrastive

So if you say:

• Zmieniamiy go, nie tamten = We change this one, not that one

then a fuller form may appear for emphasis. But in your sentence, go is the natural choice.

Sometimes Polish does omit objects if they are obvious from context, but here go sounds natural and complete.

• czasem zmieniamy go z powodu pogody = clear and standard
• czasem zmieniamy z powodu pogody = possible only if context strongly makes the object obvious, but by itself it sounds incomplete to many learners

So including go is the safest and most natural choice.

It means because of the weather.

Breakdown:

• z powodu = because of, due to
• pogody = genitive form of pogoda = weather

So:

• z powodu deszczu = because of the rain
• z powodu choroby = because of illness
• z powodu pogody = because of the weather

Because the expression z powodu requires the genitive case.

The base noun is:

• pogoda = weather

But after z powodu, it changes to genitive:

• z powodu pogody

This is a very common thing in Polish: certain prepositions or fixed expressions require a specific case.

Yes, in many situations you could say przez pogodę, and it would still mean something like because of the weather.

But there is a slight difference:

• z powodu pogody sounds more neutral, formal, and clearly causal
• przez pogodę is common in everyday speech and can sound a bit more direct or conversational

So your original sentence is perfectly good, and a little more careful in tone.

Yes. Polish word order is flexible, though not completely free.

Original:

• Nawet jeśli mamy własny plan na weekend, czasem zmieniamy go z powodu pogody.

Other possible orders include:

• Czasem zmieniamy go z powodu pogody, nawet jeśli mamy własny plan na weekend.
• Nawet jeśli mamy własny plan na weekend, z powodu pogody czasem go zmieniamy.

These versions are all understandable, but the original order sounds very natural and balanced.

Word order in Polish often changes emphasis, not basic meaning.

It is in the present tense, but it expresses a general or habitual truth.

So mamy and zmieniamy are present-tense forms, but the meaning is not necessarily right now. It means something like:

• Even if we have our own plan for the weekend, we sometimes change it because of the weather.

This is very common in both Polish and English: present tense can describe repeated behavior.

Not exactly in the same way.

• jeśli = if
• gdy / kiedy = usually when

So here jeśli is correct because the sentence is conditional:

• Even if we have a plan... we sometimes change it...

If you used gdy or kiedy, the meaning would shift more toward when rather than if.

You might also see nawet gdy, which can work in some contexts, but nawet jeśli is the clearest match for even if.

Not quite.

• na weekend = for the weekend
• w weekend = on the weekend / during the weekend

So:

• mamy plan na weekend = we have a plan for the weekend
• jedziemy w weekend = we’re going on the weekend

In your sentence, na weekend is correct because it describes what the plan is intended for.

Yes, it sounds natural and correct.

It has:

• a normal conditional opener: Nawet jeśli...
• natural habitual wording: czasem zmieniamy
• a common cause phrase: z powodu pogody

A native speaker would understand it immediately, and it sounds like standard, everyday Polish.