Nothing like the sun

Today is cloudy. It is always cloudy in this place, except when its rainning!
I don't live in London, I live in the North of Spain. Yes, most of foreigners think that the sun is allways shining in Spain, but not on this side of the country.

Today is cloudy - no need for "it" because you are speaking about "today". Good job! ?Que parte de Espana es?

Nothing like the sun

Today it is cloudy. In this place, it is always it is cloudy except when it is raining!
I don't live in London; I live in the North of northern Spain. Yes, most of foreign people think that in Spain the sun is always shining, but it's not in this side of the country.

Great job! I didn't know that about northern Spain but I bet it's still beautiful.

Alternative:
Yes, most foreigners think the sun is always shining in Spain but it's not in this side of the country.

Nothing like the sun

Today, it is cloudy. In this place allways it is cloudy, except when it is rainning!
I don't live in London, I live in the Northern part  of Spain. Yes, most of foraing foreign people think that in Spain the sun is allways shining, but not in this side of the country.