It will go up and down as when your driving the oil is being pumped around a engine that's also have coolant pumped around the head and block so should keep it a nice temp unless your ragging the shit out of it , sitting there is allowing the oil to get hot hence why cars have cooling fans to cool the coolant which intern cools the oil to a safe constant temperature
Mine does this all the time so I wouldnt worry about

Cheers Paul