Unfortunately they use some random font to display the temperature in the toolbar that is not the system font and can’t be changed. Whatever they are using is larger than the clock font and distorts the appearance.

Image

Here it’s side by side with Today Weather.

The original app (geometric weather) as much better, but they stopped updating it, hence the breezy fork came to be. If only they didn’t mess with the fonts, I would have loved to use it.