Took my plane out today for a cross country flight. Flew about 3 hours. Ground temps were between 85 and 95, flew pretty low, about 2500-3000 MSL. I noticed oil temp was running a bit hotter than normal. It wasnt in the red but I would say it was 90% of the way there. Pressure was good (top of green arc), and the temp didn't change much when I tried things like running full rich, descending, changing power, etc so I wasnt horribly concerned, but of course it is some food for thought here. Should I even worry about this, or is there anything I should check? Temps seemed to drop to roughly middle of green arc after landing and taxiing.