Ładna pogoda dziś wieczór.

[Rozzwell]

English Translation

The weather is nice tonight.

Should be: Ładna pogoda dziś wieczórem.

[Hyacinthe]

@Rozzwell

Should be: Ładna pogoda dziś wieczórem.

There’s nothing wrong with the original sentence. Both are possible (in most cases they can be used as synonyms), but pay attention to the ó/o change:

1. Ładna pogoda dziś wieczór.
2. Ładna pogoda dziś wieczorem.