Hi there, @Valdimir_Tavora 
The thing is that our widget pulls the temperature info from https://openweathermap.org/. Since the Open Weather Map doesnt provide temperature decimals, there is no way to add them to the widget now.
However, I agree that it would be great to have decimals displayed in the widget too and I’ve added this idea to the Wishlist on your behalf - Display temperature decimals
If this idea gets more votes, it might be considered in the future 