This is the 7133rd most frequent Polish word.
inowrocławiu
"Inowrocławiu" is the locative case of "Inowrocław," meaning "in Inowrocław," a city in Poland.
In this sentence, 'inowrocławiu' refers to the locative case describing the city in relation to the weather.
Pogoda w Inowrocławiu jest dziś naprawdę piękna.
The weather in Inowrocław is really lovely today.
The word 'inowrocławiu' is the locative case of 'Inowrocław', used to describe the location where someone resides.
Mieszkam w Inowrocławiu.
I live in Inowrocław.
Here, 'inowrocławiu' also uses the locative case to denote the location associated with the trip.