You are right, this is obvious when latitude-longitude grid is shown (see Settings).
The reflection of the sun moves a little more north each day and will disappear before reappearing around September 20 at the time of the equinox.
Today, same temperature inversion in the morning. With a comparison of temperature at Geneva airport weather station.
The 9km resolution of the ECMWF model does not allow to show this local effect.
Sorry there are 30 minutes between these 2 screenshots which explains the 2°C difference at WS.