Si fa sol, podem pujar a la muntanya.

Fa sol is the normal everyday way to say it’s sunny in Catalan.

Literally, fer often appears in weather expressions:

• fa sol = it’s sunny
• fa fred = it’s cold
• fa calor = it’s hot
• fa vent = it’s windy

So even though fa usually means does/makes, in weather expressions you should usually learn the whole phrase as a fixed expression.

Here si means if and introduces a condition:

• Si fa sol, podem pujar a la muntanya.
• If it’s sunny, we can go up to the mountain.

Be careful not to confuse this with sí with an accent, which means yes.

So:

• si = if
• sí = yes

The accent changes the meaning.

Catalan often leaves out the subject when it is understood, and in weather expressions there is usually no need for a separate word like English it.

English says:

• it’s sunny
• it’s raining

Catalan says:

• fa sol
• plou

So Catalan does not need a dummy subject like English it in these cases.

Podem is the we form of the verb poder (to be able to / can).

Conjugation:

• jo puc = I can
• tu pots = you can
• ell/ella pot = he/she can
• nosaltres podem = we can

So podem pujar means we can go up / we can climb.

You use podem because the subject is we, even though the subject pronoun nosaltres is omitted.

Pujar literally means to go up, to climb, or to ascend. In context, pujar a la muntanya can mean:

• go up the mountain
• go to the mountain area
• sometimes climb the mountain, depending on context

The preposition a is common after pujar when indicating destination:

• pujar a casa = go up home
• pujar al cotxe = get into the car / go up to the car
• pujar a la muntanya = go up to the mountain

So this is a normal Catalan structure.

Catalan often uses the definite article where English may or may not use one.

Here:

• a la muntanya = to the mountain / up to the mountain

The article la is there because muntanya is a feminine singular noun:

• la muntanya = the mountain

In many cases, Catalan sounds more natural with the article than English would.

Yes, that is also correct.

Both are natural:

• Si fa sol, podem pujar a la muntanya.
• Podem pujar a la muntanya si fa sol.

The version with si fa sol first emphasizes the condition more clearly, similar to English If it’s sunny, we can...

When the conditional clause comes first, a comma is commonly used:

• Si fa sol, podem...

The comma separates the conditional clause from the main clause:

• Si fa sol = condition
• podem pujar a la muntanya = result

This is similar to English:

• If it’s sunny, we can go up the mountain.

If the si clause comes after the main clause, the comma is often omitted:

• Podem pujar a la muntanya si fa sol.

Yes, you could say Si fa sol, nosaltres podem pujar a la muntanya, but normally Catalan leaves subject pronouns out unless they are needed for emphasis, contrast, or clarity.

So the more neutral version is:

• Si fa sol, podem pujar a la muntanya.

You might include nosaltres if you want contrast:

• Ells no volen venir, però nosaltres podem pujar a la muntanya.
• They don’t want to come, but we can go up the mountain.

Usually it expresses a real or likely condition in the present or near future:

• Si fa sol, podem pujar a la muntanya.
• If it’s sunny, we can go up the mountain.

This is the normal pattern for practical conditions:

• si + present, then present or another suitable tense

For more hypothetical or unlikely situations, Catalan can use different tense patterns, but this sentence sounds like an ordinary real-world plan.

Yes. Muntanya can refer to:

• a mountain
• the mountains
• a mountain area or countryside area, depending on context

So pujar a la muntanya may suggest not only literally climbing one mountain, but also going up into the mountains if the context supports that interpretation.

Catalan often lets context determine how specific the meaning is.