This is the 695th most frequent Icelandic word.
næstkomandi
"Next" or "upcoming."
In this sentence, 'næstkomandi' is used as an adjective referring to the upcoming Wednesday.
Ég mun fara í sund næstkomandi miðvikudag.
I will go swimming next Wednesday.
Here, 'næstkomandi' modifies 'viku', indicating the week that is nearest in the future.
Fundurinn er skipulagður fyrir næstkomandi viku.
The meeting is scheduled for the next week.
In this context, 'næstkomandi' describes 'mánuð', pointing to the month directly following the current one.