Is it normal for a car with no overflow to dump a bit of antifreeze after a day

I have a rubber hose from my radiator that will leak out a little coolant if I fill the radiator too high. After driving in the hot weather I always check my radiator levels as general pratice to see if any of the coolant has evaporated, sometimes I need to add a little water, usually less than a 20 oz bottle to top it off again. My car runs cool about 195 degrees, I got a radiator cap that has a thermostat built into the cap so I can constantly monitor the temperature level.