Rainbow Lore
The rainbow has had many meanings in many cultures, the main similarity being that it is always connected with deities. In the Christian Bible the rainbow was set in the sky as God's pledge that there would never again be a great flood. In Burma the rainbow is a dangerous spirit; in India it is a bow from which divine arrows are fired. In Norse mythology the rainbow is the bridge that Odin built from Midgard, the home of men, to Asgard where the gods lived, and the souls of the worthy dead passed along the rainbow. In ancient Rome the rainbow was the many-coloured robe of Isis, attendant to Juno.
It is lucky to see a rainbow, and to wish when it is first seen, but unlucky to point directly at it, which will lead to bad luck or at least to the return of the rain. In Ireland, anyone who found the place where the rainbow touches the ground would find a pot of gold at its foot.
A rainbow in the morning means further rain during the day, but a rainbow appearing late in the day means the rain is gone for the rest of that day. Small broken pieces of rainbow appearing on a cloudy sky are sometimes called Weather-galls, and signify storms and blustery weather.
Rainbow Weather Lore: If a rainbow fades very quickly, good weather is on the way.
A rainbow generally means that the rainy period is about to end.