Í dag er bara venjulegur dagur.

Yes. Í dag is the common everyday way to say today in Icelandic.

It is best learned as a fixed expression:

• í dag = today

Although you can look at the parts separately, learners usually do better treating it as one time expression rather than translating it word for word.

Because dagur changes form depending on its role in the sentence.

• dagur is the dictionary form
• dag is a different case form of the same noun

In Í dag, the noun appears in the fixed expression í dag, so you get dag.

At the end, in venjulegur dagur, the noun is in its basic nominative form, so you get dagur.

So the sentence contains the same noun twice, but in two different grammatical forms.

Here bara means just or simply.

So:

• Í dag er venjulegur dagur. = Today is a normal day.
• Í dag er bara venjulegur dagur. = Today is just a normal day.

In other contexts, bara can also mean only, so its exact meaning depends on the sentence.

Because Icelandic does not have a separate indefinite article like English a/an.

So:

• venjulegur dagur = a normal day

Icelandic simply uses the noun phrase without adding a word for a.

Because Icelandic adjectives must agree with the noun they describe in:

• gender
• number
• case

Here, dagur is:

• masculine
• singular
• nominative

So the adjective must match it:

• venjulegur dagur

For comparison:

• venjuleg bók = a normal book
• venjulegt hús = a normal house

That is a very common masculine singular nominative ending pattern in Icelandic.

In this sentence:

• dagur is a masculine noun in the nominative singular
• venjulegur is an adjective agreeing with that noun

So both words happen to show masculine singular nominative endings. It is not a coincidence, but it is also not that every masculine word always ends in -ur. It is just a very common pattern.

Because Icelandic usually follows a verb-second pattern.

That means the finite verb often comes in the second position of the clause. Here:

• Í dag = first element
• er = second element

So Í dag er... is exactly what you expect in Icelandic.

This is one of the biggest word-order differences from English, and it is very important to get used to.

Yes. Icelandic often puts a time expression first, like Í dag, and then the verb comes second. That means the noun phrase can appear after the verb.

So even though English learners may expect the structure to line up differently, the important thing is:

• Í dag = time expression at the front
• er = verb in second position
• venjulegur dagur = the noun phrase being talked about

Also, Icelandic does not need a dummy subject like English it in a sentence such as Today is a normal day.

Yes.

• Í dag er bara venjulegur dagur. = Today is just a normal day.
• Í dag er venjulegur dagur. = Today is a normal day.

Both are grammatical. Adding bara makes the sentence feel a little more like just, simply, or nothing special.

Sometimes, yes, but moving it can change the emphasis.

In this sentence, Í dag er bara venjulegur dagur is a very natural placement. It emphasizes that the day is just ordinary.

If you move bara, the sentence may still be grammatical, but it can sound different in focus or less natural depending on context. For a learner, the safest version is the one you already have.

Usually it means something like:

• normal
• ordinary
• usual

In this sentence, ordinary or normal both work well. The overall feeling is that today is not special or unusual.

So bara venjulegur dagur is very close to:

• just a normal day
• just an ordinary day

A rough learner-friendly approximation is:

ee dahr er BA-ra VEN-yu-le-gur DAH-gur

A few helpful notes:

• Í sounds roughly like ee in see
• j in venjulegur sounds like English y
• stress in Icelandic usually falls on the first syllable of the word

So:

• Í dag → stress on Í
• bara → stress on BA
• venjulegur → stress on VEN
• dagur → stress on DAH

The real Icelandic sounds are a bit more subtle than the English approximation, but this will get you started.