Best placed in December. It straddles the celestial equator, so it is visible from essentially anywhere on Earth at the right time of year.
Sextans is centred near right ascension 10.5 hours, declination -7°. It straddles the celestial equator, so it is visible from essentially anywhere on Earth at the right time of year.
It reaches its highest point in the sky around local midnight in December, which is when it is easiest to pick out. Earlier in the year it rises before dawn; later, it is already setting in the evening.
SkyRef draws Sextans in its real position for wherever you are, right now, along with the other 88 IAU figures.