Rainbows form when raindrops refract sunlight into a spectrum of colors. The brighter the sun, the clearer the rainbow.

Hawaii 's regular sunshine, short rain showers and clean air come together to create some of the planet's best conditions for ...

Hawaii’s mix of frequent rain showers, abundant sunshine and crisp air creates an exceptional environment for stunning ...

So when the sun is behind you and the rain in front of you, you see a rainbow of colours reflected back from inside the raindrops. As well as the lovely colours, rainbows also have a unique shape.