Technically speaking there is no "in the sun" temperature because it would depend on how much thermal energy the thermometer material absorbs from light.
On the other hand an object in sunlight will have temperature that has very complex relationship with a lot of parameters including shape of the object or windspeed.
Further, the object will not come into equilibrium and will show a gradient of temperature meaning the readout will depend on where you measure.
I suppose the air (the wind) tends to be colder than objects in the sun, since most sunshine pass straight through the air.
A way to investigate this, is to step barefoot on flat black stones, in the summer sunshine