The weather today

It seems incredible, but it's true,: (use a colon here) it rains has rained for three days. I don't remember a time with worse weather worst.

The worst problem Worst of all, are the streets that become rivers. (Removed "are" because it was in teh wrong tense, changed "The worst problem" into an introductory clause of "Worst of all")

We are used to the sun and to have having nice sunny days.

Unfortunately, it's winter, and usually the weather is bad like these days.

I hope that spring will come soon, bringing better climatic conditions then i'm going to so I can ride my bike again. (I added "so I can" in order that the end of the sentence relates to the first part via cause-and-effect: you hope that spring comes soon - the cause, so that you can ride bike again - the effect)

I hope all my corrections make sense.

Also, I hope the weather gets better soon, because personally, I hate the winter (I live in the state of Indiana, and it can get down to -20 degrees celsius in the wintertime ... no fun!)