There is nothing wrong with your car, it is running fine. Under 100c is normal, that's the way mine runs on a 60 degree day. Check your owner's manual, page 12, quote "Up to red marking: Maximum permissible temperature" and on page 58 it elaborates: "If the antifreeze mixture is good to -30c/-22f, the boiling point of the coolant in the pressurized cooling system of your vehicle is approx. 125c/257f.

During severe operating conditions and stop-and-go city traffic, the coolant temperature must not rise above the red marking"

So your car is perfect, you don't need to do anything. Unless you think you know more about it than the people who designed and built your car.

Removing the thermostat or doing other modifications will do more harm than good.