Tørrdrakten er varm.

The ending -en marks the noun as definite in Norwegian, so tørrdrakten means the drysuit.

The basic noun is en tørrdrakt = a drysuit
The definite form is tørrdrakten = the drysuit

Unlike English, Norwegian often puts the at the end of the noun instead of using a separate word.

Yes. Norwegian very often joins nouns into one word.

Here:

• tørr = dry
• drakt = suit

So tørrdrakt is a compound noun meaning drysuit.

This is very normal in Norwegian. English sometimes writes similar ideas as one word, two words, or with a hyphen, but Norwegian usually prefers one compound word.

Er is the present tense of å være = to be.

So:

• jeg er = I am
• du er = you are
• han/hun er = he/she is
• tørrdrakten er varm = the drysuit is warm

Norwegian does not change the verb for different persons the way English does. The form er stays the same.

Because the subject tørrdrakten is singular and common gender.

In Norwegian, predicate adjectives (adjectives after verbs like er) still agree with the noun:

• En tørrdrakt er varm = A drysuit is warm
• Et hus er varmt = A house is warm
• Draktene er varme = The suits are warm

So:

• common gender singular → varm
• neuter singular → varmt
• plural → varme

Since drakt is a common-gender noun, varm is correct.

Drakt is a common gender noun in Bokmål, so you say:

• en drakt = a suit
• drakten = the suit

Because tørrdrakt ends with drakt, it follows the same pattern:

• en tørrdrakt
• tørrdrakten

Because Norwegian usually expresses definiteness with an ending on the noun.

So instead of:

• the drysuit

Norwegian says:

• tørrdrakten

That -en already contains the idea of the.

A rough guide is:

• tørr: the ø is a rounded vowel that does not exist exactly in English. It is somewhat like the vowel in French deux or German schön.
• rr: in many dialects this is a tapped or rolled r, but pronunciation varies.
• drakten: roughly DRAHK-ten, with the first syllable stressed.

A very rough English-friendly approximation might be: TURR-drahk-ten, but this is only approximate, especially for ø.

It is pronounced roughly like varm, with an a more like father than cat.

The r is pronounced, though exactly how depends on dialect. In many dialects it is clearer than in most English accents.

Not in this sentence by itself. Here tørr is part of the compound noun tørrdrakt = drysuit.

So:

• Tørrdrakten er varm = The drysuit is warm

If you want to say the suit is dry, that would be:

• Drakten er tørr

That is an important difference:

• tørrdrakt = a type of suit
• tørr = dry, used as an adjective

Yes. That would mean A drysuit is warm.

Compare:

• En tørrdrakt er varm = a drysuit is warm
• Tørrdrakten er varm = the drysuit is warm

So the difference is indefinite versus definite.

No, this is the basic Norwegian sentence pattern:

Subject + verb + adjective

So:

• Tørrdrakten = subject
• er = verb
• varm = adjective/complement

It matches normal English word order quite closely:

• The drysuit is warm.