Hello! I like your use of language. You have a great grasp of English and hopefully you can see the corrections I have made. If you have any questions please ask.

The weather.

Now, I am living in Berlin, so I can tell you how is the weather is here in this town. The weather here. It is very wet in winter, and it is so unsettled. It's raining right now, but, five minutes ago, it was sunny. Here, As the weather is changeable  in the same day, you could wear a coat because it's cold or a cap and shorts because it's hot on the same day. You never know what clothes to wear because you never know how it will be the will be weather.

I come from of a sunny country, where always, or almost always, there is sun is in the sky, and I can sometimes find it, even it's irritating. You must use spread sunscreen lotion protection creme on your face before to going outside. at the street, and, Sometimes, it's so hot that you don't want to leave home,. By contrast, this have a the good side is you can make plans to go to one day in the beach because you are can be sure that day it won't will not rain. But now I live in Berlin here and I don't do not have sunny weather everyday, and I miss it .

As the weather is changeable - similar to unsettled I think the sentence is clearer with this statement.

alway - we always use always.

There is sun - we use the sun. There is used when showing someone a thing. Such as where is the sun? There is the sun.

Sun spread - I like the imagery here. I think it would be true to say you need sun protection all over and outside is more general than the street. Street on it's own has no context. As when I go outside I am not in a street.

Shortening to don't, I'm - This is fine in written English this is usually informal.

By contrast - I think you can drop the good side. Or you could say "The benefit of the predictable weather is..."

I think as you have spoken about Berlin, then country x then Berlin again, it is important for clarity to say where here is. But now I live in Berlin.

In spoken English we would start a sentence with but. When written we tend not to.

If you have any questions please ask.

The weather.

Now, I am currently living in Berlin, so I can am going to tell you how about the weather in this town City (Berlin is a city). The weather here is very wet in the winter, and it's so unsettled Unsettling. It's raining right now ,but,five minutes ago, it was sunny. Here/In Berlin (Personally, I would make another reference to Berlin in this sentence to remind the reader), in the same day, you can wear a coat because it's cold, or a cap and shorts because it's hot on the same day. As a result, you never know what clothes to wear because you never know how it will be the weather will be. I come of a from sunny country, where it's always, or almost always, there is sunny in the sky, and sometimes, even it's which can be irritating sometimes. You must spread protection creme in your face before you to go out at on the street, and sometimes, it's so hot that you don't want to leave home.(end of sentence, otherwise it will become too long). But by contrast in retrospect, this type of weather have has a good side, because you can plan one day in the beach because make plans to go to the beach and you are sure that day it won't rain that day . But now,  it's not sunny I don't have sun everyday here in Berlin and I miss it.