Bare in mind, we all shoot for the perfection of 3 o’clock but BMW considers anywhere in the white as normal depending upon how you are driving the car.
If if that is as hot as it ever goes, on a hot day, in traffic, then it is fine. Yes it could be better but you don’t need to sweat it.
Check your gauge is electrically correct. I recommend the ground improvement regardless. Verify the temperature by alternate means if you can.