Aries: Ares the God of war, representing masculine fire energy and competition. Aries the astrological sign is fiery and also has a competitive energy. 

Taurus: Persephone, the goddess of Spring which is Taurus season. She also represents feminine energy.

Gemini: Hermes, as Gemini is ruled by Mercury and the planet Mercury is named for the god Mercury..the equivalent of Hermes. Hermes is a messenger and the god of communication. Also he flew which could be representative of air, talkative and social..much like Gemini.

Zeus could be associated with Cancer because of obvious reasons. He's nurturing although ruthless when he believes he needs to dish out vengeance. He's defensive and driven by desire. Also a shape shifter- which fits the Cancerian personality.  

Leo: Apollo the Olympian god of the sun corresponds with Leo for obvious planetary reasons. He is also the god of music and poetry, it's known that Leo is a lover of the arts- they also represent light/ warmth and are a masculine sign.

Virgo: Connected to Demeter as Virgo is frequently depicted as a woman carrying grain..much like Demeter. She is the goddess of harvest which puts her in direct correlation to the month of Virgo. Demeter is also quite "chaste".

Libra: Aphrodite is associated with Venus and so is Libra. Aphrodite was also known to be quite vain which is one of Libras downfalls, she was compassionate when she needed to be much like Libra. Also by being the goddess of love she relates to Libras who often are lucky in love or have many romantic partners. Aphrodite was associated with harmony much like Libra.

Scorpio: Hades corresponds with Scorpio because of their common connection to Pluto. Hades is often known as evil which is a huge misconception as he's dutiful- ruler of the underworld, he is not afraid of darkness. He's often misunderstood much like Scorpio. Scorpio is known as the sign of sex and death which relates to Hades. He was also the only god who never cheated on his wife, displaying loyalty which is a well known Scorpio trait.

Sagittarius: Relates directly to Artemis as she's the archer Goddess also associated with forests the might of the centaur. She is seeks quick revenge to her enemies and is known as a light bringer, corresponding to Sagittarius being a bringer of knowledge and truth.

Capricorn: Hestia relates to Capricorn in several ways. She is a hard working and practical goddess, known for stoicism and strong will. Most prevalent during the winter solstice she corresponds to Capricorn in that way as well. (Also associated with Cancer in that she's the goddess of the Hearth.) She maintains down-to- Earth set of priorities.

Hera, the goddess of marriage is also associated with Aquarius. Mid-February was known as the month of love and marriage to the Greeks which also happens to be the month of Aquarius. Hera also maintained a powerful status which she fulfilled with grace, Aquarians are known to hold powerful positions with much ease.

Pisces: Pisces is associated with Poseidon for obvious planetary reasons as they both have to do with Neptune. Poseidon was God of the Sea and all it's creatures so the double fish symbol is quite appropriate. Pisces is associated with the feet and Poseidon often cause tremors. Pisces also makes sense along with Poseidon's ever changing, impulsive and constantly fluctuating emotional nature. Also Poseidon's more selfless and merciful side coincides with Pisces.

(Got this from Tumblr)