It could be, or it could be a faulty guage or its sender unit. Run the car up to temperature and feel the top hose to tell when the stat opens, and you should be able to tell at that time whether the engine is hotter than it should be at that point without reference to the guage.
Another thing to consider is the volage regulator. Have you noticed the temperature and fuel guages rising as the engine RPM increases?
Currently over 35 years worth of fixing 35 boxes.
Hoping to reach 65 years worth of fixing 65 boxes.