New to Cardiff and worried about the weather.

Hii, I am moving to Cardiff this Saturday as an exchange student. But lately I am hearing that the weather in this time of the year is awful, people say that it rains every day, it is dark and cold. And I was wonderning if someone of you there could tell me if that is true. And if you think that this Saturday is going to rain a lot. And also, what do you do those rainy days to spend the time? I am worried I will have a hard time😔