Rainbows form around the antisolar point, the point exactly opposite the sun (look at the ground on a sunny day and that is where the shadow of your head is!) If the sun is moderately high in the then rainbows that form can appear very close to the ground, as is the case here. Statistically you are less likely to see a rainbow like this because the cloud producing the rain is more likely to block the sun!
I took perhaps 20 shots of this rainbow but it was the first hand held shot that showed the best colour. This was the second rainbow of the day. The first is here:
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`anmari has been spreading her infectious positivity throughout our community for over 6 years. Throughout this time Ana has been at the core of all things devious, passionately developing an eclectic gallery, helping organise devmeets, participating in chat events and also recently completed dedicating her time as a Community Volunteer. We are absolutely delighted to bestow the Deviousness Award for May 2013 to `anmari, congratulations! Read More
Sta.sh
Its raining
Its sunny
There is a rainbow
The rainbow is in the opposite direction to the sun
Can I see the rainbow?
I think that will give you a better chance of seeing it on the rare occasion it does happen!