Kvelden er magisk.

Because -en is the definite singular ending.

• kveld = evening
• kvelden = the evening

In Norwegian, the idea of the is often added to the end of the noun instead of written as a separate word.

Kveld is a masculine noun in Bokmål.

Its usual forms are:

• en kveld = indefinite singular
• kvelden = definite singular

So this sentence uses the definite form: kvelden.

Grammatically, yes, but the meaning and feel change.

• Kvelden er magisk = refers to the evening, a specific evening or the evening as the topic
• En kveld er magisk = an evening is magical, which sounds much more general and less natural in most situations

A very natural alternative would be:

• Det er en magisk kveld = a common way to say that it is a magical evening

Er is the present tense of å være (to be).

So here it means is.

A useful thing for English speakers: Norwegian verbs do not change for person the way English verbs do. For example:

• jeg er
• du er
• han er
• vi er

It is always er in the present tense.

Because magisk comes after the verb er, so it is a predicate adjective.

Compare:

• en magisk kveld = adjective before the noun
• den magiske kvelden = definite noun phrase, so the adjective becomes magiske
• kvelden er magisk = adjective after er, so magisk is correct

So even though kvelden is definite, the adjective stays magisk here because of its position in the sentence.

Yes. Magisk is an adjective, and it is closely related in meaning to English magical.

In everyday Norwegian, it can mean:

• literally magical
• wonderful
• special
• enchanting

So depending on context, it may be literal or figurative.

Usually evening.

If you want night, the usual word is natt.

So:

• kveld = evening
• natt = night

That means this sentence is about the evening, not the night.

No, this is the normal order for a simple statement:

• subject + verb + complement
• Kvelden
  • er
    • magisk

That is very standard Norwegian word order.

If you turned it into a yes/no question, the verb would come first:

• Er kvelden magisk?

A rough learner-friendly guide would be:

• Kvelden ≈ KVEL-den
• er ≈ a short air/ehr sound, depending on dialect
• magisk ≈ MAA-gisk

A couple of helpful notes:

• The stress is on the first syllable of kvelden
• The stress is also on the first syllable of magisk
• In natural speech, the d in kveld can be weak

Exact pronunciation varies by dialect, but KVEL-den er MAA-gisk is a good starting point.

It is natural, but it can sound a little poetic or expressive, depending on context.

Why?

Because saying the evening is magical is slightly more descriptive and atmospheric than just giving a plain fact.

So it works well in:

• descriptions
• storytelling
• romantic language
• dramatic or emotional speech

In casual conversation, people might also say something like:

• Det er en magisk kveld

That can sound a bit more conversational.