På fredagar brukar vi ha picknick i parken om vädret är bra.

På fredagar means on Fridays / on Fridays in general.

Swedish often uses:

• singular for one specific occasion: på fredag = on Friday
• plural for a repeated habit: på fredagar = on Fridays

So in this sentence, the plural shows that this is something that usually happens regularly, not just once.

You can compare:

• På fredag har vi picknick. = We’re having a picnic on Friday.
• På fredagar brukar vi ha picknick. = On Fridays, we usually have a picnic.

With days and parts of the week, Swedish commonly uses på where English uses on.

Examples:

• på måndag = on Monday
• på tisdagar = on Tuesdays
• på helgen = at/on the weekend

So på fredagar is the normal way to say on Fridays.

Brukar means something like usually, tend to, or be in the habit of when it is followed by another verb.

So:

• vi brukar ha picknick = we usually have a picnic / we tend to have a picnic

It is a very common Swedish way to talk about habits.

A few examples:

• Jag brukar läsa på kvällen. = I usually read in the evening.
• Hon brukar komma sent. = She usually comes late.

Because brukar is followed directly by the infinitive without att.

So you say:

• brukar ha
• brukar gå
• brukar äta

Not:

• brukar att ha
• brukar att gå

This is similar to English verbs like can or must, which are also followed directly by another verb.

This is because Swedish follows the V2 rule in main clauses: the finite verb normally comes in the second position.

Here, På fredagar comes first, so the verb brukar must come next:

• På fredagar brukar vi ha picknick...

If the subject comes first instead, you get:

• Vi brukar ha picknick på fredagar...

Both are correct. The difference is mainly emphasis:

• På fredagar... puts focus on the time.
• Vi... starts more neutrally with the subject.

Yes. Ha picknick is a normal and natural expression in Swedish.

It matches English quite closely:

• ha picknick = have a picnic

You may also hear other ways to talk about picnicking, but ha picknick is very common and straightforward.

In this expression, Swedish often uses picknick without an article after ha.

So:

• ha picknick = have a picnic

This is best understood as a set expression. Swedish does this in a number of common phrases, where English would use a/an but Swedish does not.

So even though picknick is a noun, ha picknick is the standard phrase.

Because i is the normal preposition for being in a park or at a park in this kind of sentence.

• i parken = in the park / at the park

Swedish and English do not always use prepositions in the same way. Here, i is the usual choice.

Examples:

• Vi sitter i parken. = We are sitting in the park.
• Barnen leker i parken. = The children are playing in the park.

Here om means if.

So:

• om vädret är bra = if the weather is good

This introduces a condition: the picnic happens only if the weather is good.

You can compare:

• Vi går ut om det inte regnar. = We go out if it doesn’t rain.
• Om du vill, kan vi vänta. = If you want, we can wait.

Swedish usually says vädret when talking about the weather in the general sense.

So:

• vädret = the weather

This is one of those cases where Swedish normally uses the definite form.

Examples:

• Vädret är fint idag. = The weather is nice today.
• Hur är vädret? = How’s the weather?

So om vädret är bra is exactly what you would expect.

Because bra does not change form here.

Many Swedish adjectives do change depending on gender, number, or definiteness, but bra is irregular in the sense that it stays bra in these common uses.

So you say:

• vädret är bra
• maten är bra
• de är bra

The form stays the same.

Yes. Varje fredag also means every Friday, and it is very close in meaning.

Compare:

• På fredagar brukar vi ha picknick...
• Varje fredag brukar vi ha picknick...

Both are correct. A small nuance:

• på fredagar often feels like on Fridays / as a general Friday habit
• varje fredag can feel slightly more like every single Friday

But in many everyday contexts, they are very similar.

Because in modern Swedish, you usually do not put a comma before a subordinate clause like this.

So the normal writing is:

• På fredagar brukar vi ha picknick i parken om vädret är bra.

English often uses commas differently, so this can feel surprising to learners. In Swedish, commas are generally used more sparingly.