Technically it is ok because it is not on the red BUT don't fall for that corporate back-covering.
Modern cars should be rock-solid at the middle of the scale after running for a while. By modern I mean anything equipped with and OBD port and by running I mean doing anything reasonable with your car.
If the temperature goes crazy too fast (less than 15 minutes from cold), you might consider the thermostat, which is likely your case.
If the temperature quickly stabilizes from a cold start but keeps creeping upwards, you might suspect the water pump is bad or the presence of air pockets inside the coolant galleries.
Like all diagnosis, always check everything you can. Start with coolant level, coolant aspect, check for leaks, check pump belt, check heat gradient, check radiator blow-by, compare dash indication with a thermometer reading, check all fan stages, remove foreign objects from the radiator fins.