The Lunar rainbow can be experienced for 3 days during full moon at high water levels at the Victoria Falls.
What is a Lunar Rainbow?
A full moon is bright enough to have its light reflected by raindrops just as is the case for the sun. Moonlight is much fainter of course, so the lunar rainbow is not nearly as bright as one produced by sunlight but it is an ethereal sight worth seeing.
Lunar rainbows have been observed since at least the time of Aristotle.
Months that are famous for the best Moon bows are April, May, June, July and August.