You take a chance on having an outdoor wedding... you wait for that 10 day forecast keeping your fingers crossed hoping for a bright sunny day! Gosh darn it....rain. Well don't fear because it truly is good luck! Rain symbolizes blessings, cleansing, unity, and a new day. Rain brings water to make flowers grow, which is where we get the expression "tying the knot." The knot of stems of flowers. Fertility is also a sign of growth brought on by rain! But it is all about the cleansing and starting from a new slate.
An Italian wedding saying, “Sposa Bagnata, Sposa Fortunata,” which when translated literally means “Wet Bride, Lucky Bride.”
History lesson brought to you by : http://www.dasinfo.com/rain-on-wedding-day