Car running more hot than usual

This car has always run at a certain temperature. Lately car has been running more hot than usual, however it is NOT overheating. I did notice that the vehicle's fan is not turning on until much later than usual. There are no leaks in the cooling system that I have noticed. I'm assuming that maybe the temp sensor of the fan switch might be going south. Any thoughts on this? I'm trying to do fix this issue before it becomes an even bigger problem down the road. Any help would be much appreciated. Thanks for reading.

-Steve