Questions & Answers about Det regner i dag, så vi holder oss inne.
In weather expressions, Norwegian uses det as a dummy subject (like English it in it’s raining). It doesn’t refer to anything specific; it’s just there because Norwegian clauses normally need a subject.
Norwegian usually expresses “it’s raining” with the verb regne: Det regner.
Det er regn is possible but sounds more like “There is rain / It is rainy (in a factual way)” and is less idiomatic than using the verb.
regner is present tense. In Norwegian, the present tense commonly covers both:
- habitual/general present (“it rains a lot here”), and
- ongoing present (“it’s raining right now”), depending on context. Here i dag makes it clearly “today (now/these hours).”