The Cat as a Soothsayer

Cats can forecast the weather: they predict the wind by clawing at carpets and curtains; rain is highly likely when a cat busily washes its ears.
In mythology, the cat was believed to have great influence on the weather. Witches who rode on storms took the form of cats. The dog, an attendant of the storm king Odin, was a symbol of wind. Cats came to symbolize down-pouring rain, and dogs to symbolize strong gusts of wind. This may be where the phrase "it's raining cats and dogs" originated.
Some people believed that if a cat washes its face and paws in the parlor, company's coming.
If a cat continually looks out a window on any day, rain is on the way.
A black cat seen from behind fortells a bad omen.
A stray tortoise shell cat fortells bad omen

Some cats can predict earthquakes (actually, there is some truth in this "folklore").
When a girl living in the Ozark Mountains received a proposal of marriage and was uncertain whether to accept, she folded and placed 3 hairs from a cat's tail into a paper under her doorstep. The next morning, she would unfold the paper to see if the hairs had formed themselves into a Y or N before answering her suitor.
Sailors used cats to predict the voyages they were about to embark upon. Loudly mewing cats meant that it would be a difficult voyage. A playful cat meant that it would be a voyage with good and gusty winds.
Some people believe that cats are able to see the human aura, the energy field that surrounds each of us.
If early American cats sat with their backs to the fire, the owners knew it foretold a cold snap.
A cat sleeping with all four paws tucked under means bad weather is coming.
Some people believe that cats may be able to see the spectre of death.
If a cat washes behind its ears, it will rain (no doubt this superstition began in some very rainy country!)
A cat sneezing once means there will be rain.
If a cat sneezes three times, the family will catch a cold

A sneezing cat is a sign of future wealth.
A cat sneezing is a good omen for everyone who hears it. - Italian superstition
Early Americans believed if a cat washes her face in front of several people, the first person she looks at will be the first to get married.
If there is a cat washing on the doorstep, the clergy will visit - American folklore
When the pupil of a cat's eye broadens, there will be rain. - Welsh superstition

If you find a white hair on a black cat, you will have good luck.
One Roman dream interpretation was that dreaming of being badly scratched by a cat foretold sickness and trouble.
French peasants thought that black cats could find buried treasure, if they followed a specific ritual: find an intersection where 5 roads connected, then turn the cat loose and follow him.
A strange black cat on your porch brings prosperity. - Scottish superstition

Tortoiseshell cats were believed to be able to see into the future and could give the gift to a lucky child in the household.
Sailors believed that if a cat licked its fur against the grain it meant a hailstorm was coming; if it sneezed, rain was on the way; and if it was frisky, the wind would soon blow.
When the pupil of a cat's eye broadens, there will be rain. - Welsh supersition
A bride will have a happy married life if a black cat sneezes near her on her wedding day.

Sacred cats kept in a sanctuary in ancient Egypt were carefully tended by priests who watched them day and night. The priests interpreted the cat's movements - twitch of a whisker, yawn, or stretch - into a prediction of an event that would happen in the future.

The Pennsylvania Dutch place a cat in an empty cradle of a newlywed couple. The cat was supposed to grant their wish for children.
In Scandinavia, the cat stood for fertility.
It was a popular belief that cats could start storms through magic stored in their tails - so sailors always made sure that they were well-fed and contented.
When you see a one-eyed cat, spit on your thumb, stamp it in the palm of your hand, and make a wish. The wish will come true. - American superstition
A black cat crossing one's path by moonlight means death in an epidemic. - Irish superstition

The Hindu believed the cat was the symbol for childbirth.
King Charles I of England owned a black cat, whom he valued very much. He treasured the cat so much that he had his guards watch over it 24 hours a day. As luck would have it, the day after the cat died from an illness, the king was arrested.

Some believed that black cats carried demons.