Well, no. 6500K is daylight under an overcast sky (or open shade). Direct sunlight at noon is closer to 5000K. The exact value will probably vary a bit due to light scattering (blue is scattered more than red).
And according to NASA “raw” sunlight, before it hits the earth’s atmosphere, is 5772 K (of course independent of time of day).
Also, that 6500K in the white balance module is a reference value, unrelated to the actual image. It serves to provide a fixed starting point for the color calibration module.