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The way I see it, and I know it's not strictly correct, is that in our summer the Sun has a more southerly declination and so whether rising, high in the sky, or setting it has to be further south than the celestial equator. As the celestial equator is the line from due east to due west, peaking at an altitude equivalent to 90 degrees minus our latitude, then the Sun must therefore rise south of east and set south of west between the September and March equinoxes. This would be reversed if you were in the northern hemisphere.
(For reference, the Sun only rises due east and sets due west on the equinox days, regardless of our position on Earth)
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