It´i’s funny because i, I was born in a city when ire on a normal day you are atit’s 38 degree cs Celsius.

1. “It’s” is a contraction of the words “it” and “is so there’s no need to write both words with the apostrophe
2. The word “because” is not needed here, and the sentence looks better without it
3. In Spanish, the word “en” can translate to both “in” and “on” in English. But the correct word to use here would be “on”. It may sound a bit weird and I don’t know why we say it like that, but that’s just how it’s said in English.
4. Same thing as the last correction, “where” is used instead of “when” here, I don’t know why, that’s just how we say it in English.
5. This last part is completely understandable, but that is not how it’s commonly said. We’d say “it is 38 degrees” like how you’d say “it is a sunny day” or “it is raining”.

I like the beach and a sunny days, but I hate being sweaty all day.

1. What you said works, but since you’re talking about how you like “a sunny day”, it’d make more sense to refer to sunny days in general, so we’d make it plural.

Now I live in one of the most coldest cityies in America and I love it.

1. “Most cold” works, but “coldest” sounds more natural
2. The plural form of city is “cities”. This is because whenever we make a noun that ends in y plural, we add “ies” instead of just “s”.
Examples:
Singular: Baby, puppy, library
Plural: Babies, puppies, libraries

I can wear whatever I want, walk through the city without any problems and do a lot of things.

1. When you say “with any problems”, it’d sounds like you’re saying you have a lot of problems when you walk through the city. You’d say “without” instead.

The rRainy days are a problem but I´m a stay-at-home man, I love staying at home and watch aing movies or playing a games with friends.

1. You do not need to use the word “the” here.
2. The phrase “stay-at-home man” would sound better in my opinion. Like the phrase “stay-at-home mom” (A mother who stays at home with her children while her husband goes to work). But alternatively you could say “I’m a man who loves to stay home.”
3. Since you already used the verb “staying”, so you’d add ing to “watch” because you’re using the progressive tense.
4. “A movie” and “a game” work, but it sounds better to just make these words plural.

Now I only travel to hot cities onfor vacations.

I hate the heat

It´i's funny because iI was born in a city when inre a normal day you are atis 38 degree cs Celsius.

Less is more.

I like the beach andon a sunny day, but I hate being sweaty all day.

Now I live in one of the most coldest cityies in America, and I love it.

I can wear whatever I want, while walking through the city without any problem, and can do a lots of things.

There are countless ways to write the same sentence. Here is an alternative:

I can wear whatever I want while walking through the city without any problem.

The rRainy days arcan be a problem, but I´m a home man,body. I love staying at home and watching a movie or playing a game with friends.

Now I only travel to hot cities onfor vacations.

It´is funny because iI was born in a city whenre, in a normal day you are, the temperature is at 38 degree cs Celsius.

"I" is always capitalized.

I like the beach and a sunny day, but I hate being sweaty all day.

Now, I live in one of the most coldest cityies in America and I love it.

I can wear whatever I want, walk through the city with any problem and do a lot of things.

The rainy days are a problem but I´m a home manbody, I love staying at home and watch a movie or playing a game with friends.

Now, I only travel to hot cities on vacations.