Monday - Monday gets it's name from the moon, so it's not surprising that this day rules over lunar matters including instinctiveness, psychic gifts, maternal nature and water magic.
Tuesday - Tuesday gets it's name from the Scandinavian god, Tyr, who presided over laws and athletics. HIs name also means "counsil". Tuesday influences matters of physical and mental activity, including reasoning and adventure.
Wednesday - Wednesday was named adter the Germanic god Odin, who presided over magic, the muse and shrewdness. Wednesday therefore influences creativity, innovation, occult studies, and psychic insight.
Thursday - Thursday is Thor's day. In Scandinavian tradition, Thor was a kindly god who ruled the weather, blessed marriages, and made sure oaths were kept. Thirsday's energies influence relationships, weather magic (especially rain) and commitments.
Friday - Friday was named for Frigg, who's name means "well beloved". Frigg was originally a moon goddess who protected marriages. Friday continues to influence personal passions, devotion, love and resourcefulness.
Saturday - Saturday was named for Saturn, a roman vegetation god whose festivals included abundant feasting and socialization. Saturday's energies influence personal transitions, accent encouragement and clarify the principle of reaping what we sow.
Sunday - Sunday is the sun's day. Since the sun represents the god aspect and all it's energies, Sunday influences logic, reasoning, leadership skills, and the conscious mind. it's also considered a "blessed day" for all solar-related magic.