Each day of the week is ruled by a different deity and has an energy field and vibration all its own. For this reason, some magickal practitioners like to perform spells on a day in harmony with their intent. Working with the vibrations of a specific day is a great way to increase the effectiveness, power, and success of spellwork.
Sunday — ruled by the Sun; Power, prosperity, health, banishing evil, and exorcism; The first day of the week is an excellent time to work efforts involving business partnerships, work promotions, business ventures, and professional success. Spells where friendships, mental or physical health, or bringing job back into life are an issue work well on this day, too.
Monday — ruled by the Moon; Intuition, dreams, psychic ability, female fertility, and the Goddess; Monday's energy best aligns itself with efforts that deal with women, home and hearth, the family, the garden, travel, and medicine. It also boosts rituals involving psychic development and prophetic dreaming.
Tuesday — ruled by Mars; Courage, energy, physical strength, and banishing negativity; The energies of this day best harmonize with efforts of masculine vibration, such as conflict, physical endurance and strength, lust, hunting, sports, and all types of competition. Use them, too, for rituals involving surgical procedures or political ventures.
Wednesday — ruled by Mercury; Divination, communications, knowledge, wisdom, and study; Wednesday's vibration adds power to rituals involving inspiration, communications, writers, poets, the written and spoken word, and all matters of study, learning, and teaching. This day also provides a good time to begin efforts involving self-improvement or understanding.
Thursday — ruled by Jupiter; Good luck, wealth, healing, male fertility, and legal matters; The vibrations of this day attune well to al matters involving material gain. Use them for working rituals that entail general success, accomplishment, honors and awards, or legal issues. These energies are also helpful in matters of luck, gambling, and prosperity.
Friday — ruled by Venus; Love, sex, marriage, fertility, and friendship; Friday's energies are warm, sensuous, and fulfilling. Efforts that involve any type of pleasure, comfort, and luxury, as well as the arts, music, or aroma (incense and perfume) work well on this day. As Venus lends its sensuous influences to the energies of this day, use it for any magickal work that deals with matters of the heart.
Saturday — ruled by Saturn; Psychic ability, meditation, and communication with spirits; Because Saturn is the planet of karma, this day is an excellent time for spellwork involving reincarnation, karmic lessons, the Mysteries, wisdom, and long-term projects. It is also a good time to begin efforts that deal with the elderly, death, or the eradication of pests and disease.
SOURCES: Wejee's Wiccan Correspondences and Everyday Magic: Spells & Rituals for Modern Living by Dorothy Morrison