Your Venus is not in detriment (Scorpio or Aries).
The square is valid as is any aspect up to 8° in a natal chart for most astrologers. At astro.com setting the orb factor to 85% will limit aspects to this number. The default (100%) includes aspects up to 10° -usually too wide unless Luminaries are involved as they confer more energy. These planets are in compatible elements but hard aspects with Saturn are rarely eased by anything.
Looking at this aspect within a wider context, it makes sense and fits together with other parts of the chart to flesh out a "story" of relationship and family karma to give the square more validity. Saturn is the Lord of Karma and Venus is the ruler of your Libra South Lunar Node -the marker for past lives in the sign of partnerships, and in the house of siblings. Saturn is also square the Moon which (aside from acting as the subconscious memory bank for this and past lives) also represents mother and/or family clan. And Saturn is in the house of family and roots, and conjunct Juno, asteroid of marriage. One possibility (speculating here based on the symbols) is that perhaps you were restricted by marriage and family obligations and so in this life your soul strives to break that pattern and be independent (Aries North Node), to travel, study, pick up a good philosophy (NN in the 9th, Saturn's main lessons through Sag.) and to be creative (energy focused in Leo, ruler of the North Node in the 5th) as you may not have been or could not have been before?